Target: Orion at 250mm.
Versions 18.5.15 alpha and 17.458 both hang on initiating WIPE. The former flashes green once and the latter flashes green a few times.
Then I restacked at a different % in DSS. Still hangs.
Then I cropped to 50% instead of 71%. Still hangs.
Then I re-StarTooled a stack I did of a different target two days ago. Everything works fine.
Then I went back to Orion @ 250mm and didn't adjust "Ignore Fine Detail" in the AUTODEV module. Now it works fine.
Ignore Fine Detail causes StarTools to hang.