We have a Flex 1.5 app our clients use. 99.9999% of the time when our sales people go on a demo for a potential client, the app loads just fine. That .0001% of the time, the initial progress bar gets to a certain percentage and just sticks. In one situation, having the sales person demoing use or install Firefox on the client's machine did the trick. We have a similar situation with a potential client and we have tried everything. We've cleared caches on both browsers, we've uninstalled and reinstalled the Flash plug-ins for both IE and Firefox we've upgraded to IE 7 no matter what we do, the app loads up and stops at 8%. It loads for every other existing client and every other demo sales goes on it loads on all of our local machines in-office this one single client's office cannot load the app and the best part is, it loaded for them last week when the sales first went to demo. They went in for round two this past week and the app will not pass 8% on any of their machines.
Any suggestions?

