BB Curve 83xx :: Turn Power Off Icon Disappeared

I posted a description of a problem I'm having on another BlackBerry forum, and although several suggestions have been offered, no solution has been achieved. Thought I'd try the CrackBerry community to see if I can get the problem solved.After installing updated BlackBerry desktop and device software yesterday, the arrangement of icons on my screen had changed, so I was moving them around to be in the desired locations. In the process of moving the Turn Power Off icon, it simply disappeared instead of showing up in the new location. A responder suggested that it might be hidden and to try Show All. I had no Show All option - just Move, Hide, Add Folder, and Switch Application. Another suggestion was that I might have moved the missing icon to a folder. I have three subordinate folders, and it's not in any of them. It's also no longer on the main "desktop". The next responder said to try a battery pull. That had no effect, and the icon was still missing. The next suggestion was interesting - switch to a different theme, see if the Turn Power Off icon is there, and then switch back to the original theme. I've been using the Verizon theme, so following the suggestion I switched to the BB Dimension Icon theme.

Guess what - a Turn Power Off icon showed up, along with the other icons that were completely scrambled compared to the way I had organized them with the Verizon theme (and there were no subordinate folders). I clicked the icon to power down and then powered up again. The BB Dimension Icon theme was still active, and a Turn Power Off icon was still present. Next I switched back to the Verizon theme. There was no Turn Power Off icon to be found anywhere. I am ready for another suggestion. Can a theme become corrupted? If so, is there a way to refresh it?