I updated 10.5.20 (Windows) today to 10.5.30 and all seemed well until I tried loading existing projects - none of which will play back audio tracks. I have checked the audio configuration, removed and re-added the required buses, routed the tracks to the new buses - but nothing works. In addition, all MIDI tracks now play random note-lengths - where some play back correctly, while others (e.g. 4-beat notes) play for a fraction of their actual length. Finally, the playback cursor is way behind the actual playback - as if there is some sort of MIDI latency going on (the same things also happens if I create MIDI tracks in a new project).
All of this worked fine in 10.5.20 - and nothing has changed on my system other than the Cubase update. Any suggestions as to what I can do to rectify this would be gratefully received, as - in its current state - Cubase has become totally unusable.