I just checked and I do not have any problems here. Can you let me know what exactly you are doing, step by step, to get this problem? Also, can I ask what computer hardware and OS you are using?
And by the way, changing frame rate should be handled by AP without problems. It is not supposed to require re-import. Also with this issue, are you able to reproduce this issue – let me know if you can do a step by step here. Sorry, for the trouble. Thanks for the help!