I’m experiencing the same thing with changing fonts when quitting and reopening. Seems to only be affecting some titles and not others. Have validated all fonts.
At first, thought it might be connected to the Undo bug (where Undo becomes grayed out and FCP stops saving from that point forward) – but it appears to be a separate issue. Because my current method (as of yesterday) of working in FCP…make a change; check for the Undo bug by keeping an eye on the Edit menu for a grayed out Undo – make a change; check for the Undo bug – make a change; check for the Undo bug, etc. doesn’t apply to the changing font issue. Normally, if I quit immediately after noticing the grayed out Undo it will save the last change. Not so with the font bug. I can quit without Undo being grayed out and the fonts will be wrong upon relaunch regardless.
Have to admit I’m about to give up on FCP X. I first noticed the Undo bug when I lost 2 hours of color correction yesterday. And now this font bug. Hand splicing film was faster than working around these bugs. The font issue is serious enough, but a minor annoyance compared to the Undo bug, which is a show stopper. Have searched everywhere here and on the Apple forums and have seen lots of complaints, but haven’t seen a confirmed solution to that one. If anyone can point me to a solution, it would be greatly appreciated. In the meantime, will be sure to report back if I run across a solution to either of these.