We have been having some problems. This will be used to produce 30 minute commercial animation, not hobby project. Created /modified model in Poser, failed to import into RDS 5.0. Got RDS 5.02 patch, import worked but file failed to reopen. Problem stopped happening once drives defragged, but since problem is an intermittent this is no guaranteed solution. Options are: 1) keep defragging and performing "save as incremental backups 2) upgrade to RDS 5.5 and do same 3) Purchase Light wave and move on 4) Issue confounded by tight schedule, so learning curve time for light wave, as well as no experience with know bugs is problematic. I would really appreciate opinions on each of these options if you have experience with them.