Repair virtuemart plugin conflict

I have a virtuemart plugin which, when activated, conflicts with virtuemart. The result of the conflict is that you are unable to see orders - when you click to view an order it shows part of the page and then just stops. This problem was not there a few weeks ago when I got a freelancer to work on it. There as a conflict between this plugin and another plugin - they had a function and variables with the same names so they were conflicting. He changed the names in this plugin but they must now be conflicting with other variables or functions within virtuemart. Unfortunately that freelancer will now no longer reply to my requests for him to fix his own work. This should be a very quick and easy job for someone who knows what they are doing. A backup was created before he worked on it so it should be easy to see the differences and work based on that. I need this work completed urgently. Unfortunately as I have already had to pay someone else to screw this up I don't have a very big budget. I will be accepting a bidder today and will require them to start straight away. When bidding please include the phrase "I'm ready when you are" in your bid so I can easily filter out the junk. Tahanks for reading.