Assembly Cut not showing up

[desilvan]

Can anyone tell me why my assembly cut will show correctly one time and then disappear in the graphics window later on? I modeled my tool body and did the Insert | Combine | Assembly Cut and it works fine (had a few tweaks at first). I have one sketch creating three profiles that cut three different parts. Hiding the tool body made it show in one case but not now. I've also rearranged some objects higher in the assembly Part Navigator (added a sketch and some datums) which resulted in the cut disappearing. These changes had nothing to do with the cut feature. If I delete the cut and rebuilt it, everything shows up fine again. Seems total random.

Using NX 8.5.3.3