A few weeks ago, I wrote a 90-minute CD-R using my Pioneer A05 using VOB InstantDisc and it worked fine.

That was with Firmware v1.3

A few days ago, I upgraded to v1.33

I just tried to write another 90-minute CD-R and it only gets reported as an 80-minute - 79:59.74 by Nero CDSpeed.

Did I balls up by upgrading the Firmware?