Ok, I copied a two minute clip from a BD (this was a movie preview), making sure I selected BD5 as the output. DVDFAB still created a certificate folder, even though I had the option selected to create a fully compatible output without certificate. No biggee. I used Imgburn, making sure that the  use normal book type for BD Video was selected, used the 'Write Files/Folders to Disc" mode as I normally do with BD-R, but only added the BDMV folder (made sure file system was set to UDF 2.50). Imgburn  asked if I wanted to add CERTIFICATE folder, twice, and both times I declined.
Voila! This time it created a proper structure and the disc played ok on both my PC software player and standalone player. Not sure if it was the setting as in my prior post, or the omission of a CERTIFICATE folder (or both) but now it played ok.
Btw, I used a re-writable DVD+RW since this was just a test and didn't want to create yet another coaster.
Try this  and post your results. Curious to see how it works out for you.