Hold down control key when starting NT 8 to start in safe mode. That will normally resolve problems with starting.
Comment out the SubStrategy properties when doing dev work on the chart. This will allow you to rebuild without having to add/remove the strategy. You can comment them back in when finished.
Alternatively you can develop with the substrategy properties commmented-in in the strategy analyzer and it shouldn't have that problem.
If you leave substrategies commented in and do development on charts, you can just ignore the exceptions and re-add strategy until it works. The exceptions are not serious. Sometimes a window will open behind primary window-- you may have to close it to get rid of exceptions.