Just finished testing; results are:4802X, which had no problem on a Roku (TCL, model 7121X) TV also had no problem on an old Sony Bravia, leading me to believe the 4802X (Ultra) is trouble free (re Tablo sound).
The 3930X (Express), which had the no-sound problem on the Sony Bravia was moved to a somewhat newer Sony, model KDL-40W590B, and had NO PROBLEM. Conclusion: it's a Roku model/TV model dependency.
For the astute reader that wonders why I had a Roku Utra front-ending a Roku TV in the first place: An earlier problem created by Roku caused Tablo (4th gen) to freeze due to memory corruption. I found that an Ultra would sidestep this problem. In making the changes above, I reverted back to native mode on my TCL Roku, expecting to be confronted once again with the memory problem. But NO. that problem appears to now be fixed (at least on my TCL Roku TV. Probably attributable to the fact that when I reconnected this TV to the internet, it did a download. But curiously, the download did not update the OS. It is still Roku 13.0.0, not the 14.0.4 that has been downloaded to the Ultra and Express devices. Could it be that Roku has smartened up at last, and turned off automatic downloads of the troublesome 14.0.0? Who knows? Certainly Roku is not at all forthcoming in any of this debacle.
