Firefox doesn't complete file transfers with yousendit.com
I use Firefox (Mac) as my browser of choice at work. I have been a regular user of the www.yousendit.com website for file transferring. Only recently, I can no longer complete file transfers on the Mac. The progress bar stalls at the very beginning and does not advance. This doesn't appear to be the case on the PC side at work, as I can perform these actions. I'm wondering if a recent update (Firefox 3.6.6) or some other change has altered the functionality and causes a conflict while working with yousendit.com -- Mac side only?