I'm about to perform the nuclear solution. Again. The mistake I made was to take advice from an Apple employee and "up" grade to Mavericks. Because Mavericks offered new capabilities to FCPX. I got greedy.
Before that, FCPX worked beautifully, despite missing the new "capabilities". In Mountain Lion I got not a single beach ball of death, aside from the normal, occassional Apple beach ball (they really must fix this).
I am about to go back to Mountain Lion, another ridiculous "up" grade that left multiple software programs I'd purchase AT THE APPLE store useless and unusuable on my MacBook Pro. "sigh"
I refuse to buy another computer from Mac. Also because they've gone nuclear on CD drives. No more CD drives!!! Goofy decision. THey refuse to acknowledge that we use their computers for our jobs.... I just don't get it....
But I will dowload Mountain Lion for $20 to restore it, and see if that helps restore the previous useable condition.
What a shame they can't seem to fix this pervasive issue. I'll keep you posted.
As for my computer info: 2.9 GHz Intel Core i7, with 8 GB 1600 MHz DDR3, Intel HD Graphics 4000 1024 MB graphics. Not a dedicated Graphics card, but it worked fine in Mountain Lion, so I know that's NOT the problem. I'm pretty sure there's some Code in Mavericks that is screwing this all up.
And they refuse to fix it.