Cubase 8.05 Offline export resulted issues

when running a cubase 8.05 session and exporting offline a stereo bounce, the result was a glitch in the audio file. This session is midi only, no audio AND it is a small session - not many midi tracks. Performance meter is less than a quarter. I exported twice and both times I had holes in the audio at different spots each time. I eventually exported real time and it was OK. What’s up? Anyone?