I have had Camtasia Studio Version 8.6 for a few years and it has work fine until two weeks ago. All of a sudden the bottom of the screen got cut off every time I tried to use the software, so the timeline is missing and I cannot use it. I have attached a screen shot. I have no problem with any other programs I use, including Video Builder (where all tracks are still showing. Does anyone have any idea what might be wrong? My operating system is Windows 10 (64-bit).