BD-RE reported as write protected?

Hello,

Just installed an LG GGW H20L in my Vista Ultimate 64 setup. Using the BD-RE that came with the box, I tried to burn a video image with imgburn. part way through, I got an error on the burn (my bad - I didn’t record the error). Now I can’t write to the disc - Nero 8 won’t erase, Imgburn wont erase (quick or full). Imgburn tells me the disc is write protected?

Imgburn successfully burned the same image onto an Panasonic BD-RE, btw.

Do i just have bad media? I have burned several DVD (single and dual) and another Panasonic BD-RE, no probs; just cant seem to be able to use the free one that came in the box.

Thanks!

Z