There are some issues with stealth address.
"We identified the issue, but for now, please, do not use Stealth Addresses feature.
Your funds are safe, however, do not experiment until we give an official info. "
Quote by brakmic
Brakmic has replied a little more on DeepOnion forums:
"The hard fork was successful and we can now update everything that doesn't work, for whatever reason.
It is unfortunate that this new feature didn't work as expected but we will provide a quick remedy.
For now, please, continue using the Wallet as usual and simply don't try to send via SA.
You can, of course, generate Stealth Addresses and keep them in your wallet, as they will be needed later when we have provided an update."