Hello
First of all, apologies, because I'm sure this has been addressed somewhere -- I haven't found it.
I'm by no means a power user of FCP, but it is part of my job. While editing interviews (done against a green screen) during our convention last week, I was unable to use cross dissolves to soften cuts -- the background added to V1 would basically disappear, showing the green screen (most noticeably around the subject). Veescope Key was used, if that's important. Also, this seemed to be a problem of an unpredictable nature, i.e. I would drop in a dissolve, everything would appear to be fine, I'd add others, then the problem would appear (was really under the gun -- hard to remember specifics).
Your feedback is greatly appreciated.
Randy