optimization not working

I am having problems running optimizations on a strategy that calls an external dll, i.e. a custom dll that I created myself. It has run fine with all versions up through 7.1. Multicharts freezes. If I check the rescource monitor it shows multicharts is not doing any processing. I can still run optimizations on a script that does not call any custom dll's. The good news is that those appear to run much quicker in this version because it is now using all cores. Bad news is that stuff that used to run does not anymore.

Sorry, I didn't clearly clarify that this is a new problem encountered with version 7.2.

Please make sure this dll is running fine on the previous versions of MultiCharts.
If the problem is connected with the new version of MultiCharts 7.2 please send the following information to my email (support@multicharts.com):
- the script and dll you are optimizing
- the worspace you are using
- export of symbol data (quote manager->symbol name->export data)
- optimization parameters.
We will analyze this information and do our best to help you.