I mined around 4000 charnacoin with the pool charnacoin.com. The pool shows that coins are paid but I haven't received them on my GUI wallet. The wallet is already synced. What shall I do? 
Same problem here. Pool paid out, but wallet is synced, and no money ever showed up in it.
open your wallet
go to "settings"
then choose "Show seed"
enter your wallet password as will be asking by a prompt
copy and save passphrase (nmenomic) which are given to you
"close wallet" form settings
in the opening window, after have choosing your language, choose the second option "Restore wallet from ..."
in the other opening window, paste or enter previously saved passphrase (nmenomic)
give to your wallet a new name (or keep old name but old associated backup files need to be deleted first)
go to next step and give to a new password (or keep the old one)
then your wallet will be well updated and you must have good behavior now (expected balance, unlocked amount, ...)
After this, I got the coins too. What an odd glitch... Thanks, i hope it will be fixed soon.
2/3 of coins mined an hour and a half ago on main pool is still pending. 1/3 sent and received (with the help of the man)
)