It appears that U3 (and possibly all LabJack devices) aren't closed or deleted properly in Python, so that one Python instance can't relinquish control of the device to another Python instance.
For example, if I've got 2 U3s plugged into my computer:
* testDualLabJack script will print the local IDs of both devices.
* testDualLabJack2, which opens, closes, deletes a U3 instance, and waits for a user terminate signal.
If testDualLabJack2 has not exited, the first script will only open 1 device.
I'd like to be able to hand control of a labjack between two Python instances, as it makes debugging and trouble-shooting easier.