Sony Ericsson Xperia X10 USB Debugging Detection Issues

My PC - well, specifically, Flashtool - doesn't detect that my X10 has USB Debugging turned on, even though it displays that it has been activated both in the Settings menu and the notification shade. I've tried the modded Flashtool from XDA-Dev, and the latest versions, but to no avail. Any suggestions? I believe the drivers are up to date, as I can turn storage mode on when plugging it in and transfer files just fine. Rooted, running stock. It was fine pre-root, but as soon as I rooted it the first time around, it hasn't been able to detect. Recovery can't be flashed due to the lack of debugging.