Care to tell us which option you've unchecked? Have you ever thought about checking for newer firmware for your burner(s), using better quality media or burning at 8x or 12x for best results (depends on the burner)?
What's the output of nextcopy? A VIDEO_TS folder or an ISO image? Please post the log from that burn (you can find the logs in Help menu -> ImgBurn Logs).
Uninstall the Intel Application Accelerator from the virtual machine and it should go back to normal. Have you talked with Parallels' developer about this issue?
Install this on the virtual machine, reboot it, then install this and reboot again. If they don't solve your problem (or at least return the correct error codes) then you'll need to ask Parallel's developer on how to solve it
Could you run SIW on your virtual machine and paste what it says under Hardware -> Motherboard? Also, if you can, please post what's under Hardware -> PCI. To do this select all the rows shown on the right side of the window, right-click on them and choose Copy.
Well, they aren't working now, are they? Couldn't you buy 5 Verbatim 2.4x (MKM-001-00 dye) DVD+R DL blanks for testing? Alternatively you could get an external burner that can burn your precious Memorex blanks.
Technically, DVD writing is a lot more difficult than CD wrtiting, so that's why you start getting errors burning DVDs. Also, on a laptop drive the lens are more exposed, therefore more likely to get dirty easily.
There's firmware 2.1B available for your burner. Remove any disc and close the tray before updating. Reboot after it has finished updating.
If that doesn't solve your problem please read this: http://forum.imgburn.com/index.php?showtopic=8000
There's firmware 1.04 available for your burner. Remove any disc and close the tray before updating. Reboot after it has finished updating. You might also want to try the other available write speeds.
If all that still doesn't solve your problem then please read this: http://forum.imgburn.com/index.php?showtopic=8000
//edit: only now I've noticed we've already told you this before :rollseyes: