Safari won’t upload via file selection

Suddenly Safari upload stopped working. I have tried everything: restarting, deleting cookies and cache, uploading flash and java, javascript is ok, permissions are ok, sos disk utility is ok. The upload does work via drag and drop and the upload by file selection does work on other browsers like Chrome, but when trying to upload something on any site by file selection on Safari the button does not work and the selection window doesn’t even appear. Help please... I’m already four hours in this 😥 and I do not want to upgrade to the latest OS right now. It is timely...