Can Burn BD-RE, But NOT BD-R - How Fix?

Question

The problem I'm having is, I believe, pretty well exemplified in the query of the title of this thread.
I'm using all iterations of the CS 5.0 series (I have 5.5, but haven't installed it yet), with encoding
done in AME, video files encoded in m4v and audio in wave.  Straight foward disc, with
only one subject, and no menues.  Burner is Pioneer BDR-202.  I am not identifying the
Boxx Computer and its components, since it has operated flawlessly for the last two years
since I purchased it, until now.  All programs are up to date, including CS-5, as outlined below.
All program and data files are about a year old, backed up on external hard drives.  When originally
run a year ago, both BD-RE and BD-R discs were produced with no issues.
But now, when everything is re-installed from the back-up, this problem appears.  If Encore is set up to produce
four discs, and the first disc inserted for burning is BD-RE, the disc is produced wonderfully, but
if a BD-R is next inserted, with the window entitled "Note", reading "Please insert disc for next copy
(2 of 4)", the disc is inserted, the drawer closed, and "OK" is clicked, then another window appears
entitled "Warning", and reads "Device is not ready."
That's it.  I am totally stymied, am prohibited from reproducing ANY of many saved files on BD,
and of course would not even think of attempting to produce anything new.  Unless someone here
has a solution, my business is shut down for the time being, short of purchasing an Apple, which
maybe I should have done in the first place, despite my horrible experience with that company ten
years ago.  Excuse me, all I can say is that I would be most grateful for any viable (or even any "unviable" !
suggestions that any of you might have!!!!!

Answer 1

Ramesh, Stan, Bruce, and Bill - again, thank you for your
efforts!  I am back in business again, after spending
more than 140 hours on this abomination (I only got
on these boards out of desperation - I should have
been here much sooner, and will, the next!).
THE PROBLEM IS THE BLASTED, TRUSTED,
SUPPOSEDLY INFALLIBLE VERBATIM.  Ramesh,
you hit the nail on the head.  And the comment above
re something must have been different - it was - all of
the Verbatim BD-Rs I'd been using came out of the
same just newly opened Verbatim packages.
As I indicated above, I tested the Verbatims from
two shipments secured at different times - they
both couldn't be defective, could they - wrong,
they apparently were!
Thanks for your suggestions re imgburn, what a
wonderful device, and I'll be using it from now
on.
Utilizing imgburn, I burned a flawless Verbatim BD-RW,
then placed a Verbatim BD-R in the same burner, clicked,
and an imgburn window came up, stating:
     "Device Not Ready (Incompatible Medium Installed)
     If you're sure there is a blank device in the drive,
     try again in a few seconds."
Well, it mattered not at all how many tries with how
many Verbatim BD-Rs from those two packages.
Soooooo, I then tried an individually wrapped BD-R
package, and then another, and they both recorded
flawlessly.
The two garbage stacks/packages of Verbatim
BD-Rs (which cost me $250 EACH, because they
are such a premium product, blank, printable
faces) can't be returned, even
though I have the receipts someplace for my tax
records, since they were purchased over a year ago -
they were just about the last of my inventory.
By the way, both defective stacks' packaging indicated
that they could be recorded at up to X6.
The individually wrapped BD-Rs I tried out succcessfully
were indicated to be X2, as are both of my Pioneer
burners.
Incidentally, one anomaly re my Encore - "Write Speed"
was ALWAYS greyed out (never had been before) since
I had been having this problem, and after installation
and utilization of imgburn, indicated the appropriate X2
for the Pioneer burners.
Needless to say, I am done forever with Verbatim, and
will post later today one more new thread about that
product - for the moment, I am now running out the door
to my next appointment, and can again return to my
life!