You can try to lock wallet and see what happens (make a copy of the wallet file before doing that) Mine is staking without any issues.
Try lock, unlock. Nothing happens
I had the same problem with my 1.07 wallet. Saved the wallet file. deleted everything then loaded the block-chain from 1.06 and when it stopped put in 1.07 and then added my wallet .dat....from 1.07 worked for me. Then ran a rescan..wallah worked again...
Thanks. I try this before. But try again. Now I download block chain from 1.6.