Add/Remove Comment not working

`Add/Remove Comment` is not working for me on version 5.0.6 (589), 32 bit.

Settings > Program Settings > System Integration > Integrated scripting support WSH: ticked.

I have "Comments" under the "Scripts" menu. They work if chosen via the menu.

Highlighting a line in a .css file or a .xhtml file > Format > Add/Remove Comment. ... does nothing.

Any suggestions?

Items out of the Script menu don't depend of the scripting

Add / Remove comment works for line comments, not for multiline comments.
CSS doesn't support line comments

You can use Code clips to comment your line
Select line/lines in your CSS
Press Ctrl+Space
Select comment and confirm

You can modify clip file and assign shortcuts for this clip