@Jonas ,
Thanks for letting us know. This was a bug that was recently introduced by a check that I had added in order to make sure that window surfaces were being sent correctly into E+. It affected all cases where you were running an energy model that included non-planar geometry, which I imagine you must have somewhere in your large model.
I just fixed the bug:
and this is something that I know a lot of people will experience so I have updated the version of the components on Food4Rhino.
P.S. While you can still get simulations to run in OpenStudio 2.7, I would recommend you use OpenStudio 2.5 for now and you can see the reasons in the release notes for the last stable release.