I don't have an answer for you, unfortunately. Anecdotally, I had a SONY combo DVD/VHS unit, fairly good unit, and the DVD section was very particular about reading burned DVDs. It was fine with commercially produced discs. At the same time, I also had an inexpensive Magnavox DVD player ($25) that would play pretty much any disc I put in it.
It sounds like you've properly authored your discs, so I'd also suggest trying a different brand or two of blank. Memorex discs are often considered a low-end brand for blanks. Verbatim is considered a good brand, as is JVC/Taiyo-Yuden. A different brand of blank may make the SONY happy, or it may not. As much as we'd like to think digital media is universally writable/readable, that's not the case, and finding the right combination of writer/media/reader can be a challenge.
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