I'm having the same symptoms - beagle won't index anything, event with BEAGLE_EXERCISE_THE_DOG=1 set.
It starts up, says that inotify isn't enabled (which it is, but it says I need a 2.6.13 kernel with inotify, and I have a 2.6.12 kernel with inotify), apparently starts some crawlers, and then generates an unhandled exception.
Here's the output from beagled --fg --debug:
$ beagled --fg --debug
INFO: Starting Beagle Daemon (version 0.1.0)
DEBUG: Command Line: /usr/lib/beagle/BeagleDaemon.exe --fg --debug
DEBUG: Starting main loop
DEBUG: Starting messaging server
DEBUG: Starting QueryDriver
DEBUG: Found index helper at /usr/lib/beagle/beagled-index-helper
inotify_init: Function not implemented
Inotify not supported! You need a 2.6.13 kernel or later with CONFIG_INOTIFY enabled.WARN: Could not initialize inotify
DEBUG: Starting FileSystemWatcher Backend
DEBUG: Found 10 types in BeagleDaemonLib, Version=1.4.3.3, Culture=neutral
DEBUG: Found 0 user-configured static queryables
DEBUG: Adding root: /home/nick
INFO: Starting Evolution mail backend
DEBUG: Loaded 0 records from /home/nick/.beagle/Indexes/FileSystemIndex/FileAttributesStore.db in 0.000s
DEBUG: Done starting FileSystemQueryable
DEBUG: Starting mail crawl
INFO: Starting Gaim log backend
DEBUG: Starting Scheduler thread
DEBUG: Daemon initialization finished after 1.04s
DEBUG: Will index mbox /home/nick/.evolution/mail/local/Sent
DEBUG: Will index mbox /home/nick/.evolution/mail/local/Inbox
DEBUG: Will index mbox /home/nick/.evolution/mail/local/Outbox
DEBUG: Mail crawl finished
INFO: Evolution mail driver worker thread done in .44s
DEBUG: Caught ResponseMessageException: Connection refused
DEBUG: Launching helper process
INFO: Gaim log backend worker thread done in .93s
DEBUG: Starting messaging server
WARN: Unable to set IO-priority for process to idle
DEBUG: Helper Size: VmRSS=9.8 MB, size=1.00, 0.0%
DEBUG: -uid
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DEBUG: +uid
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DEBUG: Loaded 30 filters from /usr/lib/beagle/Filters/Filters.dll
DEBUG: FileSystemWatcher watching /home/nick
Unhandled Exception: System.ArgumentNullException: null key
Parameter name: key
in [0x000c7] System.Collections.Hashtable:Find (System.Object key)
in [0x00002] (at /var/tmp/portage/mono-1.1.9/work/mono-1.1.9/mcs/class/corlib/System.Collections/Hashtable.cs:449) System.Collections.Hashtable:Contains (System.Object key)
in <0x003c9> Beagle.Util.Scheduler:Worker ()
in (wrapper delegate-invoke) System.MulticastDelegate:invoke_void ()
Anyone find a solution to this yet?