We are aware of this issue and trying to isolate the source.
If your save button is hanging, simply just use "Go Advanced" for now, you can still edit/save your threads from there.
At least until we figure this out.
This issue is a problematic Ajax feature.
I have disabled 'all' problematic features for ajax, so the save button now goes directly to the advanced editor.
the quick edit will return whenever it gets resolved. Probably the next VB update.