Blank lock screen/missing lock icon
 

I have HTC Sense disabled on my Today screen so it looks like a basic today screen. When I lock the phone, it shows the sliding unlock icon. When I slide to unlock I need to enter my PIN to use the phone (forced due to work email security). Sometimes when I turn the phone back on after the screen has turned off due to inactivity, the screen is blank (the sliding unlock icon isn't visible). The only things I can see are the top row (clock, speaker icon, signal/data icon, battery remaining icon, QuickMenu icon, and Start button). None of the items in the top row respond except for QuickMenu, but nothing in there functions since it is still locked. I end up having to soft reset the phone. I am using the most current stock ROM WM6.5.

Anyone seen such a problem or know how to fix it? Is there a program like QuickMenu that has an "unlock" link in the menus? I wonder if that could be a workaround. Thanks.