Hello villabacho.
Thank you for testing the Qt wallet.
I noticed the same problem yesterday when I resynced the whole blockchain for a wallet : I received XMR during syncing but I had to restart the whole app to see them (as the transaction history). Since refreshes are done periodically from the GUI, I think the wallet
simplewallet/
rpcwallet doesn't refresh correctly in some conditions. (ie: it seems that if a refresh failed once, the wallet will not refresh itself anymore).
Fixes are in testing :
https://github.com/monero-project/bitmonero/pull/55I will do some manual testing with recent branches.