Default [Q] new pc viber version is not showing old messages

hi all

recently viber on my laptop (win 8) has auto upgraded to version 4.2.1 (not able to upgrade to win 8 version due to "app store is not available in your region", so after upgrade to version 4.2.1, program opens easily, contacts are there, recent contacts are there as well; but when i click on any recent conversation (say the day directly before), viber shows rotating arrow but no way to see old messages.

i have message history activated long time ago,
on android phone, i'm able to see every message as normal
previously, i was able to do same on laptop, but not after upgrade
of course i'm connected to internet, even updated smilies list
even i can type in a message, but again it will not be sent, as same is not showing on android version

any ideas?