Using guenseli's lua script (found here), I assigned the Jetstream's SPD knob to my VRinsight M Panel, but for some reason I can't explain the Jetstream 41 and eventually FS freeze as soon as I turn the knob a couple of times. Can anyone help me on this?

hmmm...do you have maybe a slow PC?I have encountered this issues with my old PC, too....sometimes.It seems to be that the LUA stuff is freezing if commands where forced very (too) fast.With my new rig I don't have these problems any more... with my old it was from time to time....but very seldom.You can try if it happens if you rotate much slower.Otherwise you can try to assign a button to "Luakill PMDGblalaname" (PMDGblalaname is the name of your LUA script)With this you stop ("kill") the script.But I have never tried this out. But it doesn't damage anything!If that doesn't help, too, please ask in the FSUIPC forum!thanks