I have the same issue with my Pioneer 106D. Sometimes, I am not able to clear it by closing the tray without a CD. I have to try loading different disks and suddenly it recognizes one. It is almost as if it doesn't recognize disks sometimes.
Today, I loaded a DVD, then ejected it, then loaded a data CD. It still recognized the DVD as being present and doubleclicking on the drive icon started up powerDVD! It kept playing a blank screen until I stopped it! Then I loaded a DVD, then an auto-executable CD, and then the DVD and it tried to install the program from the executable CD that was loaded earlier!
Is there some kind of buffer that needs to be cleared?
Also, it does not read some of my Imation CD-Rs burnt before on my LiteOn but they read fine in other CD-RW drives. Any help will be appreciated.
I wonder if it is a Windows XP issue with some setting or a drive issue. Am seriously considering RMA'ing this drive in case I have a dud! Haven't burnt a coaster yet though.