HELP Pioneer 207DBK doesn't erase BD-RE DL

[ChromeBeauty]

Hi
Does any have an idea why my Pioneer 207DBK doesn't erase a Verbatim 50GB BD-RE DL?
I burned it 3 weeks ago and now I can't erase it, at that time tested CDBurnerXP and it burned it with a wrong file system, after that I used Nero and it burned it normally.
Today I wanted to erase it and both programs say it isn't an erasable disk.

Any clue what the problem could be?
I checked if I installed anything between now and then but I can't see anyhting suspicious.

[hoxlund]

what does imgburn say when you try to erase it?

[ChromeBeauty]

Problem was that daemon tools was running some things to circle around copy protection, after turning that off everything ran fine.

[hoxlund]

good to hear