Link to .capx file (required!):
Steps to reproduce:
1. Control f4 to debug preview
2. notice your active Tab.
Tab closes and preview opens
Control f4 should probably not close tabs anymore.
I think it was just June, you fixed the opposite, so preview wouldn't open when Control f4 was used to close a tab.
Operating system & service pack:
win7 64 bit w/dual monitor
Construct 2 version: