I have an assembly file that will only open if you open the sub assembly files independently first. If you try to only open the main assembly you get a "Solidworks has encountered an error" error with no other helpful information. This means I have to open 5 separate sub assemblies then open the main assembly. The funny thing is it only happens on some of our computers and we can not figure out the missing link. After it throws the error everything is frozen and you have to terminate Solidworks, EPDM, and all associated processes before anything else will work correctly. It even prevents us from capturing the Solidworks RX to record the problem and logs. Our VAR is just as stumped as we are. Using Solidworks 2016 sp2 & EPDM.