Desk Top Crash v2.4.0

I'm running a show that I built about 12 months ago and has run through every software update since.

If I select the "All Fixtures" group, "Control" "Lamp Douse", the desk top stops responding. And will restart again using Pig Open Backspace etc.

If I select just the lamps that I can douse, ie my Alpha Beams, Alpha Spots and Mac 575 etc, everything is fine.

I'm running the show on on FB4.

Cheers
Mark