Please provide details about your setup and upload a log file set at level 8 so we can see what is going on.
As a start, delete the filelist_svn.txt and run the verify files in the config and make certain no old parsers are hanging around.
Players:Showcenters 1000g/250HD/Popcorn Hour A-100 A-200
Network: Netgear XAV5201 Powerline 500mbps Adapters
Software: Windows 7 Pro 64bit Simese 2.6.5 SwissCenter latest SVN
Server: Athlon 64 x2 Dual 4400+ 2.3Ghz/4GB Mem/5TB USB Storage
PVR: Hauppauge HVR 1600 and NPVR