Huh, I've not had that reported yet for E7 (or at all). Let me look into this.
Okay, since that is a main story scene and I've not had that ever been reported before, I am inclined to think it might be an issue with a driver or incompatibility on your PC. You are not alone in this though, a check of the Renpy forums do show a few others do have this from time to time but it is pretty rare. Usually it's reported as a problem with video drivers, so make sure those are up to date. Another solution you can try is to press SHIFT+G and selecting a different rendering mode.
If neither of those resolves it, please let me know, I will dig into it further.
Thank that was half the solution, in addition I lowered the frame rate down to 30 and that allowed me to get to episode 8. The same thing happened with Alex's scene in EP.8 but same solution applied.
Thanks for the help and keep up the great work.