Ive been using Go Playalong for some time now. This is the first time I came across this issue.

I tried to export a tab I worked on, but it wont export. I tried a different tab and that exported fine.

 

Has anyone come across the issue? and What should be looking at?

It may be best to contact Go PlayAlong support, they ought to be able to figure it out and could hopefully fix their program to prevent the problem in the future.

I had this problem once. I clicked to play the song, then used the options to sync score and audio, made one extra sync so it could apply, applied this then it exported correctly. Hope that helps.