The smart people of Enscape looked in to my feedback report and recognized this bug. Apparently it will be fixed in the next update. By using your tip (to copy my project and make it a lot lighter (from 196.000 mb to 134.000) by removing a lot of components, I could at least make some stills. For now I'm good with this work around. I'll try waiting for the update, since I'm not overly file-clearing-savvy... But thanks so much for your insights!
Update: The smaller file eventually, was not workable so I followed the Enscape instructions on how the deinstall and reinstall a preview Enscape version they send me after I send in an file report from within Enscape. (including the removal of the %appdata% etc, I did it all) and now it works great again. And I'm proud of myself since I'm a lot more computer savvy then I thought!