Aultimate branding removing: ? (question marks) breaks site menu; Bug?

(the plug mentioned above as the concerned one, is not valid, I uninstalled the troubled one: Ultimate Branding)

Hi,
here we go again with the branding plugin ......

I tried to replace the 'How are you, (name)?'

Removing 'How are you' went OK, but then ....
I tried to remove the '?' ... and it all fell apart ....

By doing that, most of the menu-items disappeared ....

Reinstalling doesn't work, same problem exists after that ....

All and all (already a problem with replacing the Help/ Screen-options earlier) this plugs is a dangerous piece of coding, I think.

It seems to remove/ influence also the back-end, instead of just the front-end?
Which surprises me ... to put it mildly ...

Any suggestions?