Thanks for the prompt reply.
To answer your question, I only looked at directories, not contents.
I delayed responding because was getting inconsistent and confusing results. But I now have it narrowed down - the problem seems related to how the disc is initialized.
My problem only occurs when I'm using a 'fresh' Verbatim BD-RE 25 disc. In this case, Imgburn will insist on doing a full erase and zeroing, and the disc I then burn BDMV and CERTIFICATE folders to will play in Cyberlink PowerDVD 9 on the computer, but not on my Sony player, which reports INVALID after loading.
The log attached is for the above job.
Subsequently doing a quick erase on the disc in Imgburn and repeating the burn produced the same failure. I tried this repeatedly
I then erased the same disc in Nero (took about a minute) and then Imgburn reported that the "Disc Needs Formatting" and will not perform a quick erase, but insists on a time-consuming full erase, which I declined to do.
Instead I launched Cyberlink Power2Go, which initially reported that the disc was blank, and did a quick erase there (took a couple of minutes or so).
Imgburn then reported that the disc was "empty" and I proceeded to burn the project above.
The resulting disc played fine on the Sony.
I then used Imgburn to quick erase and re-burn the project, and it again played fine on the Sony.
Both versions of the disc display 22.5GB free of 22.5GB (i.e., empty) in Computer, so evidently this is not the problem. (The disc mentioned in my original post that showed the correct size was made by Power2Go.)
I've experimented with several discs, and until some program other than Imgburn 'erases' them the first time, Imgburn cannot produce a disc that will play on my Sony. After using another program one time, I can quick erase and burn in Imgburn successfully indefinitely.
I'm not yet sure whether running both Nero and Power2Go was necessary. Likely only one of them was, but I don't yet know for sure.
To summarize, Imgburn doesn't seem to be able to initialize new BD-RE discs such that burned movies will play in my Sony. However, a work-around is to erase the disc with other software, then return to Imgburn and the disc will work from that point forward (i.e., I never have to revert to using Nero or Power2Go again).
Does this help identify my problem?
Thanks.
Rolfe
imgburn.log