I just noticed that clicking on menu entries in the applications menu does not launch terminal-based applications any longer. Instead, a blank terminal window opens. Before it it would run the command and show you the respective options.
All graphical-based applications work fine.

Alacarte is installed and ticking or unticking "terminal" does not change anything.

Version is rolling 21-4.

Has anyone else experienced this too?
Any ideas?

Thanks a lot.