I started from scratch first layout for my taste. First I took 8-button panel and set the commands: Show only group 1 - Show only group 6, Edit groups and Show all tracks. Cool. Tested it. Show only group 1 was ok and so was also groups 2 and 3. Then, Show only group 4 put the mouse on group 4 and only selected it but did not do the right click. Show only group 5 and group 6 worked ok. what the f***, I thought.
After some serious thinking and various tests I noticed that if the mouse is anywhere else than where it is after "show all tracks" command, "Show only group 4" don't work correctly. I tested all versions of that command with same result. It's easy to fix: I just put "show all tracks" in beginning of the command. But it's weird and a bit stupid, isn't it!