Hi all, after a few days of use I'm no longer able to create new folders.

I've two custom folders with filter rules (all  working fine) but can't rename these existing folders or create new ones.
What I do is: right-click in folder area, click ADD, write folder name, press OK; folder name input popup disappear but folder  is not created.

Same on two different PC's (Windows XP and Windows 7/64 o.s.)

Simple Mail 2.9, FF 48.0.2