Sonar  X3 user with windows  7; recently  I've tried  to bounce my mix down  to a stereo  file, as I've done countless  times, however, now when the selected  tracks  are highlighted, sonar freezes  and the bounce  to tracks  dialog  box  never appears. Any attempt  to perform  any action  prompts the 'error' bell heard when a dialog  box  is open  and another  action is engaged. I don't think  anything  has changed  in sonar, but  any suggestions  would  be  welcomed. I  have bounced  down tracks  in the last few weeks  by the way  thanks in advance  

Sounds like the dialog is opening offscreen . I know users haved fixed issues like this in the past by editing X and Y values in the appropriate registry key. But I'm not seeing a "Bounce" key at first glance; you might need to do some searching:
 
HKEY_CURRENT_USER\Software\Cakewalk Music Software\SONAR Producer\X3\Dialogs
 
Or if you're running your monitor at less than max resolution, raising it might help.