Hi Mark, thanks for the response.
I used to run as admin due to issues with saving onto an internal disk that was not my boot drive, but I sorted my permissions and have just run for weeks now. Running with this line of investigation I started up as admin and couldnt drag the earlier posted midi file from desktop into an empty track, which worked when I tried the other day. As a sanity check I tried dragging midi from Air Strike VST and this worked fine and then retried dragging from Method 1 and had my problem. I have contacted support at Sound Yeti and will update once I get an answer.