Did you try again after restarting the beta client?
No. Two times I tried to connect with server [without restarting], then changed to normal client.
Also, in your Warband directory there's a Logs directory with plenty of crpg_beta_log files. Can you identify the one that applies to yesterday's play session and paste the contents?
crpg_beta_log_21.08.2012_19.58.54
[19:57:22] Mount&Blade Warband version: 20.08.21
[19:57:22] Havok version: 2011.3.1-r1
[19:57:22] FMOD Ex version: 4.42.00
[19:57:22] Command line:
[19:57:22] Initializing language...
[19:57:22] WARNING: Duplicate language string ui_retreated_battle
[19:57:22] WARNING: Duplicate language string ui_midnight
[19:57:22] WARNING: Duplicate language string ui_chest
[19:57:22] WARNING: Duplicate language string ui_group_rename
[19:57:22] WARNING: Duplicate language string ui_show_framerate
[19:57:22] WARNING: Duplicate language string ui_off
[19:57:22] WARNING: Duplicate language string ui_antialiasing
[19:57:22] WARNING: Duplicate language string ui_module_newer_than_application
[19:57:22] WARNING: Duplicate language string ui_module_older_than_application
[19:57:22] WARNING: Duplicate language string ui_difficulty_rating_percentage
[19:57:22] WARNING: Duplicate language string ui_general_options
[19:57:22] WARNING: Duplicate language string ui_video_options
[19:57:22] WARNING: Duplicate language string ui_controls
[19:57:22] WARNING: Duplicate language string ui_maximum_framerate
[19:57:22] WARNING: Duplicate language string ui_estimated_performance
[19:57:22] WARNING: Duplicate language string ui_invalid_username
[19:57:22] Using Direct3D9
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[19:57:22] Initializing renderer...
[19:57:22] Loading core resources...
[19:57:22] WARNING: Unable to find texture mp_ui_maps_e
[19:57:22] Loading language files...
[19:57:22] WARNING: Duplicate language string ui_start_tutorial
[19:57:22] WARNING: Duplicate language string ui_multiplayer
[19:57:22] WARNING: Duplicate language string ui_first_person_field_of_view
[19:57:22] WARNING: Duplicate language string ui_third_person_field_of_view
[19:57:22] WARNING: Duplicate language string ui_banner_mode
[19:57:22] WARNING: Duplicate language string ui_banner_outline_mode
[19:57:22] WARNING: Duplicate language string ui_dynamic_banner_transparency
[19:57:22] WARNING: Duplicate language string ui_on_group
[19:57:22] WARNING: Duplicate language string ui_on_friendlies
[19:57:22] WARNING: Duplicate language string ui_on_everyone
[19:57:22] WARNING: Duplicate language string ui_show_multiplayer_chat
[19:57:22] WARNING: Duplicate language string ui_show_multiplayer_team_chat
[19:57:22] WARNING: Duplicate language string ui_battle_options
[19:57:22] WARNING: Duplicate language string ui_campaign_options
[19:57:22] WARNING: Duplicate language string ui_multiplayer_options
[19:57:22] WARNING: Duplicate language string ui_sound_options
[19:57:22] WARNING: Duplicate language string ui_input_options
[19:57:22] WARNING: Duplicate language string ui_change_reflections_explanation
[19:57:22] WARNING: Duplicate language string ui_report_proficiency
[19:57:22] WARNING: Duplicate language string ui_abysmal
[19:57:22] WARNING: Duplicate language string ui_clear
[19:57:22] WARNING: Duplicate language string ui_walk
[19:57:22] WARNING: Duplicate language string ui_rear_horse
[19:57:22] WARNING: Duplicate language string ui_hide_ui
[19:57:22] WARNING: Duplicate language string ui_listen_server_could_not_be_started
[19:57:22] WARNING: Duplicate language string ui_water_reflections
[19:57:22] WARNING: Duplicate language string ui_sky
[19:57:22] WARNING: Duplicate language string ui_sky_landscape_objects
[19:57:22] WARNING: Duplicate language string ui_sound_occlusion
[19:57:22] WARNING: Duplicate language string ui_sound_occlusion_filter
[19:57:22] WARNING: Duplicate language string ui_sound_hrtf_filter
[19:57:22] WARNING: Duplicate language string ui_sound_distance_filter
[19:57:22] WARNING: Duplicate language string ui_scene_restart_required
[19:57:22] WARNING: Duplicate language string ui_game_restart_required
[19:57:22] WARNING: Duplicate language string ui_weapon_trails
[19:57:22] WARNING: Duplicate language string ui_windowed
[19:57:22] WARNING: Duplicate language string ui_gpu_skinning
[19:57:22] WARNING: Duplicate language string ui_dynamic_batching
[19:57:22] WARNING: Duplicate language string ui_specular_maps
[19:57:22] WARNING: Duplicate language string ui_normal_maps
[19:57:22] WARNING: Duplicate language string ui_free_look
[19:57:22] WARNING: Duplicate language string ui_fxaa
[19:57:22] WARNING: Duplicate language string ui_postprocess
[19:57:22] WARNING: Duplicate language string ui_postprocess_light
[19:57:22] WARNING: Duplicate language string ui_postprocess_strong
[19:57:22] WARNING: Duplicate language string ui_postprocess_color
[19:57:22] WARNING: Duplicate language string ui_multiplayer_kills
[19:57:22] WARNING: Duplicate language string ui_all_kills
[19:57:22] WARNING: Duplicate language string ui_own
[19:57:22] WARNING: Duplicate language string ui_sun_flare
[19:57:22] WARNING: Duplicate language string ui_enable_alt_f4
[19:57:22] WARNING: Duplicate language string ui_invert_mouse_x_axis
[19:57:22] WARNING: Duplicate language string ui_enable_sound
[19:57:22] WARNING: Duplicate language string ui_enable_music
[19:57:22] WARNING: Duplicate language string ui_toggle_background
[19:57:22] WARNING: Duplicate language string ui_font_scale
[19:57:22] WARNING: Duplicate language string ui_camera_controls
[19:57:22] WARNING: Duplicate language string ui_faster_camera
[19:57:22] WARNING: Duplicate language string ui_slower_camera
[19:57:22] WARNING: Duplicate language string ui_reduce_input_lag
[19:57:22] WARNING: Duplicate language string ui_sleep_wait
[19:57:22] Loading font...
[19:57:22] Initializing window manager...
[19:57:22] Creating game windows...
[19:57:22] Initializing device...
[19:57:22] Behavior flags: 50
[19:57:22] Back buffer size: 1280x1024
[19:57:22] Back buffer format: X8R8G8B8
[19:57:22] Depth stencil format: D24X8
[19:57:26] Dumping system info...
[19:57:26] -- OS: Windows XP Dodatek Service Pack 3
[19:57:26] - Version: 5.1.2600
[19:57:26] -- Memory: 3072 MB
[19:57:26] - Available: 2464 MB
[19:57:26] -- CPU: Intel(R) Core(TM)2 CPU 4400 @ 2.00GHz (GenuineIntel)
[19:57:26] - L2 Cache Size: 2048K
[19:57:26] - Features: FPU MMX SSE SSE2 SSE3 SSSE3 EST HTT
[19:57:26] - Count: 2
[19:57:26] -- GPU: ATI Radeon HD 4800 Series *
[19:57:26] - Memory: 1024 MB
[19:57:26] - Driver Version: 6.14.10.7261
[19:57:26] - DirectX Driver Version: 6.14.10.7261
[19:57:26] Loading settings...
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[19:57:40] Loading scripts...
[19:57:40] Unable to map script game_get_skill_modifier_for_troop
[19:57:40] Unable to map script game_console_command_received
[19:57:40] Unable to map script game_server_info_requested
[19:57:40] Loading map icons...
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[19:57:41] Loading time: 19539
[19:57:59] Creating game...
[19:57:59] Loading setting data...
[19:57:59] Starting game...
[19:57:59] Initializing meta mission...
[19:58:54] Exiting...
[19:58:54] Saving configuration...
[19:58:54] Exiting game at frame 8492...
[19:58:54] Exiting sound manager...
[19:58:54] Exiting network manager...
[19:58:54] Deleting game...
[19:58:54] Deleting mission...
[19:58:54] Deleting resources...
[19:58:54] Deleting font...
[19:58:54] Deleting game windows...
[19:58:54] Exiting sound manager...
[19:58:54] Exiting physics manager...
[19:58:54] Dumping resource usage information...
[19:58:54] Ondemand textures: 4
[19:58:54] Render target textures: 4/5
[19:58:54] Render target materials: 4/4
[19:58:54] Render target stats:
[19:58:54] A8R8G8B8 (4/0): 12 MB
[19:58:54] D16 (1/0): 2 MB
[19:58:54] Render target total memory usage: 14 MB
[19:58:54] Exiting graphics manager...
[19:58:54] Closing log file...