StarUML 5.0.2.1570
An error box with the message, "Cannot focus a disabled or invisible window," shows up if you unpin the ModelExplorer panel, and then restart StarUML. This message appears twice. The New Project By Approach dialog does not show up.
Logged In: NO
It is also impossible to export if this error happens.
Logged In: NO
This error message is also displayed if you run the "Verify Model" tool with the "Message" window hidden.
poor support from developer-team.
you can re-install this program to fix, but you will meet it again after 2 week.
Just don't make hidden "Model Explorer"