I Had the issue with Scriptmaster 3 and though I had hopes, Scriptmaster 4, including 4.0.2 still freezes FMP 11v2. I've set and example file to reproduce it, It's just an import then processed with a replace. It's inside a timing script and it's repeated 4 times and then displays a custom dialog.
I think in fact that it's the Custom dialog that triggers the problem, or more-so that the switching from a non gui function to a GUI one. I think script master doing intensive GUI less functions and then resuming back to the GUI causes problems.
See the attached file, just run the tim script. After it completes and you click ok in the dialog FMP freezes and CPU goes through the roof.
Thanks for fixing this, that issue renders it useless to me
MD5test2.zip