This sounds like an alt-coin, so you should move it to the appropriate section since it isn’t about bitcoin -they’ll be more likely to know the changes that have been made to the wallet.
It seems this problem could lie deeper within all QT-wallets, so I'm trying to figure out, together with a fellow crypto lover, where the source of this problem is nested.
But this means that this kind of problem could hit anyone of us.
good tip : as soon as you install a QT-wallet of any kind, FIRST dump your private key, if this does not work, do NOT send coins to that wallet, or you'll end up with the same issue I'm having right now.
FYI: check the wallet on regular bases... meaning.. try to send (weekly or even daily) 1 coin to your own address, just to see if it still works as it should.
This is how I discovered that my wallet was broken.