My update to 744 occurred yesterday at 3:48am. Starting last night, I lost access to programs on my HR44/700 with my GenieGO. The HR44 show up as in the DVR Playlist Manager, but no programs. Resets to the GenieGo returns the HR44 programs for a few minutes (and can be played) and then they disappear again (or if they are still there, I get a DVR busy error).
I don't know if this problem is an x744 issue or not. But that's the only thing that changed between when I could access my HR44 through the GG and can't.