I just came across another issue (Bloom R9): I have a rather large solution (a lot of aura components and apex classes).
After authoring some changes and trying to build them the build took forever (more than 5 minutes).
I cancelled the build which did nothing either. After waiting for another few minutes i killed the TWS process.
Apparently that triggered a problem: I'm now no longer able to pull changes from SF.
If I try to build the changes (the ones I mentioned above) again TWS tells me "Please pull first". When I try that, the "pull" dialog (incl. spinner) shows up forever (> 10 minutes) but does nothing more. It DOES however send a lot of API requests to my Dev Org (visible via SF monitoring). Restarting TWS etc. does not work either. I am the only user working in that org.
I've tried to create a new solution and pull everything in there but that does not work either (stuck just like above). I also have tried resetting the user's credentials (so no OAauth) but that did not help. I can however modify the files in the Salesforce Developer Console.
I've submitted a bug report.
Thanks for your help