I have found an interesting quirk. I use a Harmony Remote for my Roku (and everything else). With the new Roku TabloTV Preview channel, when I push a selection in a direction, it jumps two spaces, regardless of the direction. The Roku remote that came with the Roku does not do this.
There is a thread about it already.
This link comes up bad now. I am having this issue and new there was a thread about it.
It was likely linked to the old board. I think this is the correct link.