The Fact that you are able to play the BDP-S350 burned disk in another player pretty well removed the media from consideration as a potential problem. Your confirmation that it is TDK media re-affirms that.
I actually asked you the wrong question... what I should have asked was whether the player that will play the DVD is Sony or another Mfr., but even that may not be the cause (at least not the full cause)...
If the upgrade of DVDFab that you are using is the 'standard' package, ie you are using the VSO burn engine, and not another, I am strongly tempted to think that the VSO engine, which is proving problematic to other users as well, may be at the root of the problem.
... I tend to ramble too much... let's see if I can sum this up succinctly...
During playback, faulty data from a buggy burning program can cause errors of mild severity, that might be enough to cause your Sony BR drive to balk at playing a disk, whereas another player might just gloss over the errors and play the DVD anyways.
This isn't a definitive answer, but it's all we can do without extensive testing equipment and software to give you a better answer. I don't believe that Fab is the problem, though, just the burning software. The next update to Fab may feature yet another 'updated' burning engine that fixes some of these recent problems.
Checking an earlier version of Fab to compare the results will only verify that the earlier version can do the burn, and not really point to an answer for this version.