That sounds like the Data path may be wrong in your XML file - possibly. But at any rate, how come you don't update to the latest and greatest? At least the nonexperimental version. Use a 1.3.492 "setup" version and start fresh. Don't forget to backup libraries.
I have also problems like this with Nebula and Studio One. I`m in contact with a developer of Studio One and with Giancarlo since some days / weeks... For the moment no one can find any problem. Giancarlo will take a deeper look in next time. Possible he find a solution. I hope so much.