Here are additional troubleshooting tips for 2.0 as they arise. Tips for 1.0 are probably still relevant: Troubleshooting_1.x
When editing a guide, newly added boxes not saving after selecting Save changes
Michael O'B found that if you lengthen the setTimeout, it can remedy the problem.
\control\guides\guide.js Line 195 : setTimeout(saveGuide, 2000); //doubled wait time
My guides are displaying as only one column!
There was a bug with the "non-responsive" layout of subjects/guide.php. Make sure you have updated code. See here: https://github.com/subjectsplus/SubjectsPlus/commit/86576ee888cdf230dcfc21bac3986bafa6697ef7
The WYSIWYG editor box is not showing up!
Perhaps "Base Path for CKEditor" in admin > config site is not set properly. Double check that this looks right. In IIS, the installer might not get the correct path!
When I create a new user, I can't save their headshot!
It's probably a permission issue. The assets/users/ folder must allow the webserver to write to it (in order to create the folder for a new user, and then load the headshot)