I have almost the same problem after upgrading to 1019.0 (Greece). In some of my video files (MKV and AVI), you cannot go to a certain time point, or FF and REW them! My problem is restricted to few files only, but is certainly annoying. I asked the local service and they said that downgrading is imposible. Also, the latest MKV files I've downloaded, cannot playback. I noticed that in their filename, they include the word "mhd" (microHD). Probably the player is incompatible with these files.
I was informed, there was a new FW available, which I updated online from (i think) 1016.1 to latest 1018.
Now I have the problem that I cannot FF in my mkv files anymore. Some very few few files are possible, but around 90% not. This is very annoying. Does anyone have this problem too?
Is a downgrade possible? I cannot find the 1060.1 version for download.