I installed the new wallet the Dev tweeted at around 1230 utc. This immediately resolved the problems the previous QT wallet had been having. It started staking within a few minutes and I then received 2 payments just minutes apart. The 'your weight' had come off the boil a bit as a result of the payments (I guess) but it was still staking happily. Went to bed about an hour later and at around 2030 utc this morning I checked to see if any further stake payments had been received overnight. Nothing further had come in and unfortunately the wallet had gone back to "Not staking as none of your coins are mature"!

Played around with it for a bit but it didn't look like it was ever going to be rectified, even after restarting the wallet. Eventually decided to reboot my machine (Win 8.1) and start the wallet up again. That seemed to do the trick and, although it initially had the 'coins not mature' message, after a few minutes it started staking again and within an hour I'd received another payment.

Has anyone else had this happen where the wallet's stopped staking? Does anyone know why that would happen and how to mitigate it?