No solution just an observation. I have received the same error and also when I tried using (deleted).......same burner (upgraded to firmware 1.09). have tried every step you tried...when I addressed the problem to MTU tech support, they went through all the steps you used to no avail..and finally suggested I post problem to the forum...as I can see no solution. to burn, extract and play cd+g file I went with an alternate software (that works)
I sugeest you do a search for cd+g programs and find the (deleted)