Ok, so after a bit of a struggle, I got a customized button for SWFUpload. It's a transparent overlay over an inactive button. This works fine on localhost, but when I build to the test server ... it doesn't.
When I remote into the test server, it also works.
By 'working' I mean the 'browse' dialog. When I click on the button on the test server... nothing happens. And on localhost, as well as locally on the test server, I get to browse for a file to upload.
Has anyone any clue what simple fact I've overlooked here? Because I'm stumped.