Glad you found a work-around for running your Inquisit sessions. I just thought of this though if you want to try--can you run your Inquisit session from a batch file (including parameters and all)? If so, you could enter the name of the batch file in the filename of an Executable item.
Very happy to hear all the other issues have been resolved with the latest (2010.2.19) version of MediaLab.