I have the same setup and have noticed it as well. At first I thought that in process recordings were not giving me the preview windows but that isn’t the case. It does seem to be connected to how long the recording has been there for, but it isn’t tied to one version of software versus another. Some recordings have the previews some don’t. I just downloaded the new Tablo channel and so far both new recordings have them.
I haven’t nailed down what exactly the cause is yet.
I saw this happen on all new and old recordings on 2.2.6 after changing my recording quality from “1080 8Mbps” to “to 1080 720p 60fps 10Mbps” I changed that settings back to the “1080 8Mbps” and my previews all started working again immediately.
Thanks @TabloTV; I tried the reset (multiple times) but still no joy.
I do notice that the hard drive is quite “busy” since doing 2.2.6 update (i.e., even when not recording content) but it has been a couple of days so I would have hoped any preview creation/indexing would be done by now (approx 1.75 TB worth of data though). Again, for me, it only appears to affect newly recorded content since 2.2.6 upgrade.
I am traveling now so can’t physically try the reset trick again until I return; I’ll tinker with it then.