AWESOME NEWS! If you can replicate the error, let me know how!
On your problem now.
1. DFD settings on EWQL. Open Kompakt, or Kontakt, whatever you use, and go to the DFD settings. Play with them, nothing can break!
alternatively
2. Go to (inside Cubase) menus -> devices -> device setup -> VST aduiobay -> YOUR soundcard (right bellow) -> control panel. Take a look at the buffers. Increase them to 512, or even 1024.