I think i found a software issue which can be recovered with a workaround.
or maybe it is related to my Win7 OS settings , i am not sure.
Issue : Sometimes right after editing an object in level editor and/or doing some changes in properties window, workspace/layer/library windows become disabled
I try to change the location of these, also switching them to floating windows, still no good. These three become disabled.
Workaround : Whenever i click on the pin button on these windows (auto hide function) i can use workspace items until i restart the program.
When i restart the program , i can use them again but it reoccures after a while.
Anyone having the same problem ??