Using r84 on Windows 7 64 bit. Steps to reproduce:
There will be two OK buttons, one grayed out and the other works. The working button is cancel. Selecting an object activates the real OK button
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I have the intended buttons here (w7 pro 64bits). Can't reproduce.
Try to go in the preferences dialog and click "Reset dialogs".
Does it change anything ?
That seemed to fix it! I'll let you know if it reappears