After updating PyCharm (jump from 2017.? to 2018.3), I've been having issues with Git Integration. I can enable it just fine, but if I switch branches (either through the PyCharm interface or externally through the command line) the Git Integration disappears and I have to re-enable it.
I tried turning the per-branch 'workspace configuration' setting on and off, and had this problem in both cases.
Mac OS High Sierra 10.13.2
"Git Integration" and "Github" plugins are both installed and enabled.