Thumbnail does not expand when using Windows 7 x64bit

Summary of Bug

When using Confluence 3.5.6 in Windows 7 x64 bit, if a thumbnail of an image is clicked, the image will not expand, instead, it will just keep loading.

Steps to Reproduce

1. In a x64bit version of Windows 7, run Confluence 3.5.6
2. Attach an image into the editor, and ensure thumbnail is set to 'on'. Save the page.
3. Click on the image.

Findings

This bug seems to only affect the x64bit version of Windows 7, and only with Confluence 3.5.6. I have not tested the other 3.5 versions, but this bug does not affect Confluence 4.