2. "failed to create frame buffer": Rendering large (?!?!) (3600X3600) pictures with displacement, using DBR or Backburner will render all black, showing only the buckets' brackets (as in: http://forums.cgsociety.org/showthread.php?t=241005&highlight=%22mental+ray%22+size+error ).
3. Sometimes it says it can't find some maps that are not used (or which objects are hidden).
max 8 sp3, winXP sp2 , 2GB RAM