How to shut down a stuck process from Windows App version of Sage 50 Cloud

The app froze on printing an invoice, and the app no longer responds.  Since Sage is accessed through a virtual desktop hosting through the windows app, the standard task manager does not work.  Shutting down the windows app and restarting the computer doesn't work- as the process that is hung up is in the virutal environment.  There has to be a way to stop the hung process and restart the app.  I am waiting for someone to call me back to fix this, but in the mean time I have lost a couple of hours of valuable work time.  Anyone else experience this and have a solution?