Most likely it is a bug with CD Speed. It wouldn't be the first.
The one thing you should ask Plextor (I'm not sure about this) is whether or not Plextools is reading the leadout or not. Is it just ripping the tracks? I'm betting it is.
If you're going to try to make an exact copy of the audio CD want the drive to be able to read everything including the tracks, leadin, leadout, and subchannel stuff like CD-Text.
The one thing you should ask Plextor (I'm not sure about this) is whether or not Plextools is reading the leadout or not. Is it just ripping the tracks? I'm betting it is.
If you're going to try to make an exact copy of the audio CD want the drive to be able to read everything including the tracks, leadin, leadout, and subchannel stuff like CD-Text.