Found an issue though, at least with HDHomerun tuner but I think its not releasing/closing the stream properly once playback correction in enabled...
I fired it up just now to let it run and watch for errors but it told me I didn't have an available tuner, looked at my tuner status in HDHomerun and both were still showing in use from the channels we watched last night. Restarted it and tested again.
If I select playback correction and then leave the channel, it does not release that tuner back, must not be closing the stream correctly.
I just tested and selected one channel, hit playback correction, and hit 'back' on the Roku remote to get back to the guide, HDHomerun still shows tuner 1 active on that channel, selected a different channel, did NOT enable playback correction and pressed 'back' to get back to the guide and it released the tuner normally.