Some things to check:
Check your plugins. There may one be causing an issue. Do you use 3rd party plugins? If so, try removing any suspect ones.

Try running RB from the external drive. I've had good luck with that sometimes.

Do you have the latest update for your version? Check the Support button at the top of the page; if you are running the initial build there may have been a problem already fixed.

Next thing I'd try is moving the Audio Temp Directory (found in Prefs) to a different hard drive if possible; this is where RB generates and stores edits (for Undo maneuvers). Having a single drive reading/writing/jumping around may cause bottlenecks in some systems.
Lastly the mysterious hidden window; try minimizing RB, then maximizing it again .. I've seen this cause a hidden window to appear that had launched behind the main window and was otherwise unavailable.

One other; try MME drivers temporarily and see if it is a driver issue. It may be RB is unable to lock onto the drivers reliably, which can be caused by a few different things, including some other app not releasing the ASIO drivers when needed.


I do not work here, but the benefits are still awesome
Make your sound your own!