Tab key doesn't change field but acts like ctrl+tab
The previous version (6 or 7, can't remember) was working fine and the key TAB was used to change field.
Now, version 11.0v3, this key acts as Ctlr+Tab: it enters a TAB character in the field and doesn't move to the next one.
I searched arount for any preference or similar parameter, I searched also the existing posts in the forum but I couldn't find anything related (well... there were 8 thousands post to check... I stopped after about 100...)
(O.S. Windows Seven Professional 64bit)
Any help is appreciated