Hi Lindsey,
The crash when the LabJack device isn’t found is due to a very old issue in the plugin code. (This affected Mark’s code, too.) I just opened a pull request with the fix. Once you merge the pull request and rebuild the plugin, the crashes should stop.
I’m not sure what to make of the “thread constructor failed” error. I think it indicates that the process has reached the maximum number of threads that it’s allowed to create, but I don’t know why that would be happening. Does your experiment execute a lot of scheduled actions? Each of those spawns a new thread, so having a lot of them running simultaneously could lead to this error.
Chris