So while attempting to open my old project files from Sonar 8, X2 seems to load the audio files, but there's no waveform, no audio, and they say "Busy." I tried loading in some of the audio library samples, and it does the same thing, so my guess is that it can't be an issue with the audio files. Any one got any ideas on what's going on? :/

Verify your Edit > Preference > Audio > Driver Settings "Playback Timing Master"

Wow, I have no idea how I overlooked that. I went through every menu and setting, and that just got completely overlooked. All is well now, thanks much! :)

It happens when SONAR cannot find your interface. Happens to me when I forget to power up the interface before launching SONAR. Glad it was an easy fix.