No help there :-(
Is this a project you modeled from scratch or one of the samples installed with the Studio?
Perhaps you should try modelling it again from scratch and see whether the problem persist.
Failing that you could send the configuration details - open Help > About > Configuration Details, select the entire contents, copy and paste to a new text file and attach it in reply (please do not paste the content directly into a message ... it's way too long).
Perhaps your best bet is to try reinstalling the studio.
For best results, use the Firefox browser..