I just upgraded fedora 13, and boinc was one of the first packages i installed. After setup, when I realised the client wasn't running, I checked the manager gui and I see the following messages:

Mon 31 May 2010 09:46:57 PM EDT	World Community Grid	Sending scheduler request: To fetch work. 
Mon 31 May 2010 09:46:57 PM EDT	World Community Grid	Requesting new tasks 
Mon 31 May 2010 09:47:02 PM EDT	World Community Grid	Scheduler request completed: got 1 new tasks 
Mon 31 May 2010 09:47:02 PM EDT	World Community Grid	Message from server: Resent lost result CMD2_0514-2QDJ_A.clustersOccur-3BJI_A.clustersOccur_4_40004_41497_1 
Mon 31 May 2010 09:47:02 PM EDT	World Community Grid	[error] App version has unsupported platform i686-pc-linux-gnu 
Mon 31 May 2010 09:47:02 PM EDT	World Community Grid	[error] No application found for task: i686-pc-linux-gnu 614 ; discarding

The system is x86_64 and the client is also x86_64:

Mon 31 May 2010 09:14:52 PM EDT		Starting BOINC client version 6.10.45 for x86_64-pc-linux-gnu

but it seems to think (from the error messages), that it thinks it's i686.

Any help on this would be greatly appreciated! :)