If you’ve made a screen record­ing using Quick­time X, you’ll likely have dif­fi­culty import­ing it into Final Cut Pro 7 because of its vari­able framerate.

The eas­i­est way to resolve this is to take the file through Com­pres­sor first — ProRes 422 Pro­gres­sive will be great. Frus­trat­ing, but whatever.