I  use Autocad LT for Mac, and I have the strangest thing happen after using it for a while and only after I have plotted PDF files. In the lower left corner of my screen, I am unable to click on anything in the ribbon or even the layout and model tabs. There is one 'hot spot' on the ribbon where the cursor turns into a hand, and when clicked, it brings up the VIEWPLOTDETAILS dialog panel. Even stranger, if I have another window open (Chrome, email, etc) and I click somewhere in the lower left corner of the screen, it will swap windows into ACAD like there is some invisible box thats always on top of all windows. This is driving me absolutely nuts and the only way to fix it is to restart AutoCAD, but as soon as I plot PDFs it always comes back. I hope someone else has had this issue and found a fix for it. Thanks in advance for any help!