Fail when adding multiple files

If I add more than 4-7, program hangs on opening (Win10, SP7 i7/16gb ram /intel graphics tablet):

https://www.screencast.com/t/vMWuuH1v

BTW This is an awesome little tool! Thanks. I use it all the time for the layouts on my SLA printer. The auto-layout on the slicer itself suck a** compared to plater.
