My wallet working well before and after update, staking work. I don't have any problem. I only move my .dat file from old wallet folder to new wallet folder and its working without magical commands in console 
I don't know how do you upgrade wallet's but it smell's unnecessary fud 
I don't know how do you upgrade wallet's but it smell's unnecessary fud mine (the new wallet) was fine staking yesterday, al of today though rejects on pos. had 2 confirm but they're not on the chain so i've deleted everything but the wallet and am waiting for a resync
Same here not one accepted PoS coin since i updated the wallet, the last one was 20 mins before i updated wallet and every coin since has been a reject. Have done as you are in the process of deleted everything in Appdata/Roaming/CinniCoin except my wallet.dat and the cinnicoin.conf file. Have just finshed the resync, it got stuck a few time on some blocks but closing and then opening the wallet seemed to fix that, once resync was complete was still the same not one confirmed PoS coin since update my last payment from the pool was accpeted fine though. Also am not sure but my balance seemed lower after resync, did not make a note of it before sync though but am 70% sure it was 291 before sync and now 278 after.
EDIT: Have just checked the blockchain and looks like i was correct balance shows 291 on explorer but only 278 in wallet
http://cinnichain.info/address/JVgfbKMk9MrdwZry7X6iCTunTtdS2h1fYP
EDIT2: screen capture video of wallet and block explorer
http://screencast-o-matic.com/watch/c2h3lbnzuR
I was also having this problem since I upgraded the wallet, I switched back to the old wallet and everything is fine now.
I tried to use the old wallet, pos blocks are not shown up on cinnichain.info