URGENT Need fixes on Webcam based site. Php and Flash

I have a site that needs some small fixes made to it. It is a webcam based site that uses Tokens to pay for stuff such as tipping performers, paying for paid videos and photos etc... At the moment this function does not work. Anyone with a good grasp of Flash/Flex should be able to fix this rather quickly according to my previous Freelancer who did not know Flash. I have tested it briefly and noticed that it works a little better but not completely in Chrome, whereas Firefox it does not work. Also there is a problem with the sessions, so if you you view a webcam and close it, you cant view another one as it tells you that you can only have one session at a time. Also, another problem encountered was with billing so this is PHP problem I think. If a user purchases tokens once, he gets billed 3 times. That is a problem. Need this fixed also. Lastly, I have an update script of the original script which has some new functions for the webcam function. I would like this implemented but WITHOUT losing prior work done. Payment will be made only through Freelancer. Payment/Milestones will be released ONLY once work is complete 100%.