You don't need to turn off the auto-hide taskbar if you like it.
Let's say you open with auto-hide taskbar on and 'maximized' window. The menus are not available.
You go to non maximized mode, and drag the bottom right corner very slightly (the difference with maximized should not be significant). That setting is sticky. You can forget about the bug.
By the way, rather than paying for an Elements version before testing, it's smarter to use the trial version first. You don't have to bother with a refund if you are not happy.
I have the all the same problems as been reported by other people. I have had three Chat sessions, two of which tech support took over my computer for a total of nine hours. In the end they said "You have a problem we cannot fix and will get back to you". That was a week ago. I bought the electronic version so I have nothing to return. If this trouble has existed for months, why is Adobe still selling a defective product? I have over 15,000 photos that Elements 15 converted to that format and are now worthless to me. Can I say that I am more then a little upset with Adobe?