Just wanted to point this out for those who do testing and test automation. Although we’re supposed to be going off Safari on Windows and test directly Safari on Mac. But I’m sure there are still some people who use Safari 5 on Windows to do interim/tentative testing due to lack of resources of a Mac or because it’s handy to have around.
As such, just wanted to point out that Safari 5 on Windows appears to have an issue with uploading multiple files in parallel via the HTML5-based multiple file upload support. At least in the implementation of a site I test.
You won’t run into this issue with Safari on Mac. So just something to be aware of.