Hi Chris,
I can't repro this using the Black Box skin with AC 8.04 Beta with Delphi 2010 on Windows 7. Are you able to update to v8.04 and see if the problem persists on your system? I'd understand if you were hesitant to upgrade to a beta version but in this case I think it is a safe move, and new bugs are getting fixed in that branch so an update is probably inevitable.
PS If you have internal skins, don't forget to go into the skin manager and click “Update All” to get the latest versions of the skins – I think you'll have issues with version 8 if you don't.
Regards,
Hamilton