Well, i would recomend uninstaling your MX 3000 and Active sync. Re-intstall the software direclty from URC's website and allow it to auto configure with active sync. Don't update active sync. I have active sync version 3.7.1 and i program multiple 950's and 3000's with no problem. The key is if the install prompts you to set up a partnership, dont do it, select guest.
I did the activesync update when it came out last year, and all hell broke loose. I come to find out that once you upgrade, you have to run Active sync in compatibilty mode to whatever version of windows your running. So i reverted back to 3.7.1. No problems from there!
Alos,never plug the remote into your computer until the sofware is installed and open. Doing so will cuase your computer to only see your remote as an unknown device, this will block your sync up. I got nothing else.., hope this helps!!