For PC I'd need to know some more specifics about your setup, I've tried isolating issues on win7 before and was unable to find a resolution for those issues. I've also recently run into an issue with recent amd video drivers preventing me from running any ren'py games (I've just resorted to using a VM until either amd drivers rectify the issue or a new version of ren'py releases that corrects the issue).
As for android I'm currently in the process of seeing if I can replicate the issues with my device to see if I can figure out what is causing that.