What model box do you have? On my T2100 FF/REW are unusable on MotoGP (and other internet channel recordings) as it causes loss of all audio needing the box to be rebooted.
That said some experimentation last night after the update seems to suggest this issue has been resolved. Whether by accident or by undocumented intention. Always thought is was due to a memory allocation / corruption problem and it occurs to me that it could be one code module finally being rebuilt to pick up new table sizes / definitions that was missed out of previous firmware builds (25 years software experience tells me it happens).
Further good news is that they seem to have fixed the random skip result when chase-playing active internet channel recordings. Been playing around with it this evening and cannot get it to misbehave.
I'm actually getting to like this unique implementation. On the previous (2016) system you got one chance to select a jump to time (same with a certain Sat box that rhymes with Pie) unless you exited the playback and started it all again
However with this scheme you can keep jumping to whichever 10% slot of your choice suits while still in playback
I never had to exit playback to be able to make several 'time jumps' in the old software. Maybe I had faulty software, in this case faulty being a good thing 😀
Interestingly if you use this 'jump to decile' feature on a recording that is in progress then it jumps to the decile point of the recording length already recorded
ie if you press 5 on a recording of a 2 hour programme that is 1 hour into being recorded it will jump to the 30 minute point (not the 1 hour 50% of total programme point)
Likely the easiest to implement and no complaints, just takes a bit more mental arithmetic to find which number to press.