Not too sure that it is cloneDVD. I noticed the problem on the previous version of Anydvd. I have not done an update to clonedvd. And the new update to anydvd did not help.
To expand on the problem when you eject the disk it goes to a regular drive letter. Then lets say you put in a new disk and tell the drive to explore before it recognises the disk it tells you to insert disk and it will eventually load the drive with the the previous disk's name. However anydvd's screen that pops up does display the new disk info. But in clonedvd the old disk info is listed as well as explorer.
I have found if I tell the disk drive to eject wait 30 seconds and then push the button to insert the disk then hit explore it will accept the new disk.
I too am running xp sp2. I will be doing more test to see if it is only my reader drive or if it happens on my writer drive also.