I use Virtual PC for most of my development projects at work and I recently installed LiteStep with the Windows Longhorn style theme (but I don't think the theme is the problem). Almost everything is working fine, except Virtual PC, which doesn't appear on the task bar. If I want to switch to Virtual PC, I have to use Alt-Tab, since there's no button on the bar. The other apps I have running have their corresponding buttons, but not Virtual PC. Is there something I can do to fix this, since it's very annoying, or is it a known issue?

Thanks in advance.

You can ignore this. I've just restarted the computer and everything is working like a charm.