I'm running postgresql 6.5.3 on RedHat 6.2 and when I try to run vacuum from psql I receive the following message: PortalHeapMemoryFree: 0x82ca450 not in alloc set!. Also when I use the \dt command i receive the "Could'n find any tables!" message. I have the checked every database in the data directory but can't find any solution to that, any clues ??