No problems on my two Mavericks machines, Rick, that I've noticed. Both are fully updated to 10.9.2 with current FCP, Motion and Compressor, plus FCP7.
I did find a problem with the last Motion update which prevented FCP7 from working if it was in the same folder as Motion. I just moved FCP7 to a new folder within the Applications folder and all is well.
Thanks Andrew... I think the motion problem was the one I saw. Hard to keep all these things straight.