The best I can tell from everything I have gone through is there is no fix. I still have files that do this even today. I have found ways to minimize the problem but not stop it entirely. The main thing I have done is to break my machine up into subassemblies and place no more than one subassembly into an ipb file at a time. Previously I was trying to documanet our entire machine of 100-300 parts in one ipb files but to date I have had every single file of this size fail to open at some point. By using subassemblies I seem to get the error much less often and on the occasion that I do it is much faster to recreate the small file compared to the whole machine. In case your wondering I have spent a fair amount of time working directly with Autodesk on the issue. They released a service pack at one point for one of the 2013 versions that helped but did not stop the problem entirely. I currently use 2015 and still get the same issue to happen, though rarely with the smaller file size I have been using. What I was told was once you get the error there is no recovering the file at that point. You can go back to an old version that still worked but it is usually only a matter of time before it happens again.
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Corey Parks
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