Did you rerun your mp3 authorization? SONAR only comes with a 30 day trial and needs to have the full version authorized. If you remove the only authorized version from your PC, the new version of SONAR will only run the trial version. If you have an mp3 license and cannot get SONAR to recognize it, contact tech support, they can sort that out for you.

wait, never mind. this happened a while ago so I forgot the details. It was way more serious with a bunch of plugins not loading. Took a while to figure out that bitbridge had been deleted. So watch out for that.

It sounds like you removed X1 after installing X2, that is a different matter. It might be necessary to reinstall some of the shared items.