Try using the latest update v0.8.5.4, it may solve your wallet problem.
I use it!
Same here on 0.8.5.4 version of wallet.
PoS is working but is showing 0 net weight. Wallet need some adjustments but the good thing is that is working.
Same here... No stakes. Used the Espers_v0.8.5.4_Patch-6_cleanbuild-qt, and sync all the blocks trough network.