@gerald - We have tested the current generation Roku units (Roku 1, Roku 2 and Roku 3) for Tablo compatibility. We have also tested the older Roku 2 XD.
We have not tested the Roku classic models (which yours sounds like it belongs to) including the Roku SD, Roku HD, Roku XD, and Roku XD|S. There are reports that the Tablo Roku app has trouble working with these models. We’re attempting to buy and test on a classic Roku and hope to have an update soon whether these models can be supported.
@gerald - No worries!