Glitch in IE7 on pages with tabs at top of content

I'm getting a minor glitch in IE7. On pages with tabs across the top of the content area (e.g. my account it all looks fine at first but if I zoom in/out (CTRL + or -) then the text floats out of the tabs.

Anyone else seeing this? It also happens consistently with various themes in Drupal 4.6/4.7/5. Since it only does it when zoom <> 100% I'm assuming it's a browser bug rather than a Drupal/theme/stylesheet problem...? Though I don't see this behaviour on drupal.org (different theme I think) so maybe it can be fixed somehow...

Cheers

Giles