I have had the MCS shutdown several times (gray-out) with a error screen. I believe this may have something to do with the file saving path. If I manually save my work every so often I have not experienced any problems. If I don't manually save the file and an auto save works is where I believe things go awry. I usually save to the factory default area under "My PBP3 Programs". Most of the time I will save the new rewrite to a flash drive under "Save As" and use this to copy over the old file on the same computer and over the same file on another computer. I am using all the latest upgrades and have had this happen several times after having 3 pages of code written on Toshiba running W7 and a newer Dell running W10. I'm sorry I didn't copy the error code. ( It said an exception error has happened with an address and MCS must shut down). I hope this helps someone to fix this issue. It is very annoying. Now I manually save after every page rewrite. Cheers.