MC workspace hangs when I re-insert the system to the chart~

I would like to know anyone else is having similar problems as I do ..

My problem when working with MC is :

The system can be running properly, with the studies inserted to the charts. But the problems come when I would like to change any of the settings.. for instance, (1) removing the studies and reapply another study, (2) edit the script and compile it.. then, the workspace just hangs..I need to restart MC again whenever I want to change any of the settings. MC workspace become very unstable and alwayz hangs..

Has anyone experienced this problem before. Please advise on how to fix that .

Attached is one of the snapshot of the screen when error occurs.

Thanks a lot~