My (growing) list of issues or shortcomings based on feedback I've seen.
1. SPS backdoor codes mostly don't work (quick clear play bar, clock).
2. PC-->TiVo transfers (pyTivo/TiVo Desktop) not possible
3. HME apps launch points missing (HME still runs if launched via kmttg)
4. No TiVo Live Guide
5. Left button for going back no longer works - have to use Back button. Also right button can't be used for select.
6. Skip button to jump to end/start of lists no longer works everywhere, such as ToDo lists, only channel up/down and arrows work in lists. It was confirmed MyShows list and OnePasses lists do work for skip to end/start, but for example not for ToDo, My Channels, History, etc. so inconsistent at best.
7. Every program in My Shows is treated as a folder. So if you select a single recording, it opens into the list menu rather than going directly to the Play screen. Also, clicking "play" on remote doesn't work. Extra unnecessary click. Then when you delete the episode it goes to an empty list screen rather than back to My Shows.
8. TiVo,# shortcuts. Can't change first 4 Tivo,# remote shortcuts: 1=SP list, 2=ToDo, 3=wishlist, 4=search, etc. and those shortcuts are no longer what they used to be. 5-8 can be customized to what you want.
9. MRV no longer works for moving shows from 1 TiVo to another. MRS still works. For MRV you have to initiate transfers at online.tivo.com
10. This is opinion, not shortcoming per say: I much prefer simple lists for things like My Shows, ToDo, etc. instead of tiles that are all over the Hydra GUI. UPDATE: Tiles can be turned off for My Shows via preferences.
11. Re-sync times for change in resolution (if you use native output settings) seem to take much longer in Hydra.
12. Info button no longer gives you detailed show info (including size, etc) about a selected show in My Shows
13. Using a few 30skips in quick succession (to get to front of the buffer) sometimes causes loss of audio. Need to skip-back to get audio to return.
14. Clear and Delete Everything just hangs and does not prompt you to acknowledge, etc. Same with Clear Guide Data/To Do List and Clear Thumbs/Suggestions. (1 person reported this, another said it seems to be functional for them).
15. There is inconsistently sometimes no indicator (red dot) that a program you are watching is recording or not.
16. kmttg AutoSkip from SkipMode doesn't work in Hydra. UPDATE: Fixed in latest kmttg release.
17. When you press the Live TV button, it goes to live tv, but always sets the channel to 1 regardless of what channel was on previously.
NOTES:
1. SPS: 30 sec skip is default, but SPS30S can be used to toggle back to 30 sec scan. Clock mostly non-functional, quick clear play bar doesn't work at all.