I've found that the reason for the dash not being able to open is that I disabled the file manager's handling of the desktop. By enabling it everything works again. I have no idea why the issue is related to that or why this also causes the top panel to lose it's shadow.
I've found that the reason for the dash not being able to open is that I disabled the file manager's handling of the desktop. By enabling it everything works again. I have no idea why the issue is related to that or why this also causes the top panel to lose it's shadow.