Flashbuilder 4.5 - design mode suddenly greyed out

[Guest]

aaaarrrggghh

I installed a plugin from http://www.elementriver.com/sourcemate3 and also a code-color plugin from eclipse

and now suddenly after a restart my design mode is greyed out!!!!

What can I do??

[Guest]

I uninstalled flashbuilder and re-installed - now importing my projects - Everything seems to work now again