After working and stable FM solution was converted from fp7 to fp12 format in list view footer (and all buttons, located there) disappeared on layout enter in browsw mode.
They reappear after switching to layout (or preview) and back.
Also, in the case if table or form view is chosen, everything is O.K.
Any idea about reason for such unexpected behavior?
I am using respectively FMP 11 advanced and FMP 12 advanced.
In FMP 11 solution works O.K. and in 12 as described abocve.
I noticed also, that the speed of FM decreased and the difference (slowdown when switching between layouts, performing complex scripts in background) is noticeable at the first glance.