I'm not at all sure what changed with Crossover between the v.12 betas and the 12.1 release, but Tacops 4 went from useable with minor quirks (11) to absolutely unusable (v.12) to running as perfectly as I've ever seen any app (v.12.1). The only remaining glitch that I can find in Tacops 4 is a minor anomoly in how Line of Sight measurements display on screen at first (they correct themselves after a second or so).