I had the same problem even with running the most recent version of PinballX. Here's what finally solved this frustrating time consuming problem for me: Go to your PinballX.exe file or its desktop shortcut/right click on it and select Properties/under the Compatibility tab uncheck Compatibility Mode. All of my EM tables that had previously errored (they had backglasses set to "run in exe mode" to eliminate ball rolling stutter) now load flawlessly. Hope you have the same success!