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This seems to occur when I have the graphical editor open.
Visual studio is currently updated to the latest patches. Using MySQL 6.9.9, .NET 4.5 version. Can be sitting there, and crashes. Or doing work, and crashes. Or alt-tabbed, and in the background, VS crashes. Or starting a project where the .lsmodel is remembered open.
This only occurs when I have the model open in the editor - I've found if I make changes ultra-quickly, then save/apply and close the model, I can sometimes beat the 'crash timer' and get productive work done. Sometimes. If I don't have the .lsmodel open, no issues.
Using nightly 5.5 build 20160907 (Had same issue with 20160721 - was there even an update bar build number in that time anyway?).