Disappearing Taskbar

I have a really odd problem that I can't seem to fix. Sometimes when I resume from sleep mode my taskbar has disappeared, leaving a gap where it should appear.

Restarting the computer or ending the explorer.exe task and then running it again via Task Manager will fix it, but it isn't an ideal solution.

Has anyone experienced this problem before and know what it could be?

What version of Windows 7?

It's RC1, with all the Windows Updates applied. Could this be an RC bug and I just need to wait a little longer for the retail version?

It could well be a bug with RC1, but I've not heard of this happening after recovering from sleep mode. Have you got any applications or services running in the background which would interfere with the explorer.exe process?

As there are only a couple of weeks until the release date, it's not too long to wait to see if the problem stops in the RTM (which I'm sure it will).