Two fr935 users report my app doesn't work, but it doesn't reproduce on simulator.

hi,

and what ERA says? you should see where it does not work for them.

One user said "I pushed start button, but the application didn't start stopwatch."

The other user said just "Can't use"  (it seems to be from Tailand)

This symptom doesn't happens on my simulator.

BR

From your app description, it appears you are trying to do your own "long press" logic.  With the 935, it has "hot keys" were the user can selection actions based on long press, button combos, etc.  Are you sure the user isn't pressing start "too long"?

You really don't want to do your own long press logic.  Even on devices without hot keys, like the va4, long press of back is "menu", on other devices, long press of "up" is also menu.

Hot keys are something you won't see in the sim.

Thanks! This should be good hint.

My application have my own long press logic to avoid miss operation. However I need to consider changing button UI logic.

BR

Having your own long press logic will cause issues on devices with hot keys, or dedicated long press actions.  You want to stick with the standard logic for buttons/touch (or buttons and touch, like the f7 and epix2)