For those of you - like me - who suddenly find themselves getting the "insufficient disk space" error (but have tons of disk, large pagefiles, etc) I found one thing that worked for me - but which I have not seen posted here before. In the POSER4 directory, I had dozens of temp files - which appeared to be from renders which died for various other reasons and were never deleted. Deleting these files eliminated the problem. This was after trying everything else - including defragmenting the drive (I have Poser on it's own 120 GB drive). Let me rant now... I depend heavilly on Poser 4 - I have nothing but praise for this incredible tool. I have had nothing but problems with P5 and don't need ProPack (although I own both of them). I know a lot of people in the same boat. I've been a user for 3 years or so and use the program every day for work and personal projects. I sure with CL would do something to fix the memory leak problem in P4. As great as Poser is - I have never, never seen a more unreliable program. I mean, this application can die while sitting at the user interface - and doing nothing. Any chance of a new service pack coming? And I say this with the utmost respect for the application and what it can do! Thanks all, I can stop ranting now!