LS Debugger: Cannot set breakpoints

Hi,

strange effect in my LS debugger:

I cannot set any breakpoints!

(mouse double click or F9)

and any breakpopint menue entries are greyed)

Another bug? Or a wrong setting in my preferences?

Thanks in advance

Uwe

Subject: Don’t have Vista, but …

not reproducable with 8.5.1 on Windows XP / Windows 7 Ultimate