Buttons not clickable with wmode transparent and browser zoom

I have a flex application that clients want to be able to scale with the page when the user zooms the page. The wmode needs to be transparent because there is a menu on the page that comes over top.

The app sets the stage scalemode to StageScaleMode.SHOW_ALL, loads an xml with links to thumbnails and full size images/swfs. The thumbs load in a repeater, and when the thumbs are clicked they load the full size image.

In IE 7 / Safari / Chrome (PC) when the zoom is set to lower than 100% (with ctrl±) the thumbs/pagination buttons in the flash are not clickable. It seems like they are not scaling correctly.

IE8 and FF it works fine.

Test page here with wmode transparent and wmode window:
http://test.webbdesign.com/ben/wmode/static.html

Does anyone know a workaround for this?

Thanks,
bennybobw