Earlier I tried to export a video after some trimmings with QT 10.1 and got the error message "Cant not open. This Media may be damaged". But it's a pretty common MOV file, all media players including QT 10.1 itself play it fine, it just won't export the file.

Did some digging on the internet, looks like I'm not a lone. This is the second time I encountered this problem. The first time I simply changed the Export to location from Desktop to Document and it miraculously worked. This time though it did not. This has to be a bug that has workaround. Any suggestion? Thanks!