[CentOS] Problem burning DVD+RW discs

Good Day--

I've been backing up my essential stuff to DVD+R discs for quite a while 
with no trouble at all.

Last week I tried backing up to a DVD+RW with no trouble at all.

This week, when trying to re-write my weekly backup, CD/DVD Creator told 
me it could not write to the disc because it was read-only.  Is there a 
bug in CD/DVD Creator or am I doing something incorrectly.  Obviously, 
I'd like to be able to reuse discs if I can, but can go back to using 
one-use DVDs if necessary.

Thanks for any help.

Dick

-- 
"They that can give up essential liberty to obtain a little temporary
safety deserve neither liberty nor safety."

                                              --Benjamin Franklin 1755