the drop in dma mode is definitely strange.
this is the rewritten dvd writable media detection routine introduced with 18.104.22.168. [personally i like having to insert the blank media before starting the process [but thats another discussion]
yeah the need to check for blank media twice does seem redundant, ill see what i can find out about the media detection routine.
there was another user which had reported similar behavior with dvdfab dropping his transfer mode to PIO mode. wait that was you. just kidding
just click the YES button twice as per my screen shots. i assure you it is safe. i did the uninstall to take the screen shots. after the first restart you may have to wait a minute or two for the new hardware detection to fully initialize and prompt you to restart again. so just sit patiently and wait.