I had this sindrome last summer. I did a vast search of all the related questionares available in this forum. The solutions I have found from here and my own ideas, I concluded that, "The concurring saving issues are either caused by runtime errors OR import of a corrupted object." I may be VERY wrong and probably is; but since then I never had that problem again. So, you ready for this? :-) I THINK layers, grouping etc. are great help moving Vue faster and prevents it from freezing; but saving is a different animal. First idea, "run-time issue" ... Think about it, even if you try to move a BIG file from one folder to another folder it doesn't happen in a snap, it takes a few seconds. Same principal applies, when you are trying to save the LARGE Vue file it will eventually take a little time! Which is probably halted by some other program running in the background. So, I suggest you close all background programs, make sure your firewall is up & running and then work with your big Vue files. I am little sceptical about my second idea, so I'll hang on to it for now. :-) Let me know if this works for you, that way I'll know my research paid off! :-)