Disturbing to see from the German members that the Sharpness / Blur function no longer has an effect at export and a subsequent repair installation of the program fails. Support have acknowledged the problem but can not say when (or if??) it will be repaired!
Only solution is to do a system restore or reinstall and patch with the earlier patch.
Of some help - I have found that the global Sharpening in Movie Effects does stick so you could sharpen a section or clip on the timeline and export and re import the result.
I am also disappointed to see that the Rt. Click > "Display" surround tracks problem I reported some time ago, that causes the sound tracks for overlapped (Cross faded) clips to stair step onto lower tracks, is still not fixed.