After trying to send miotas, wallet UI becomes black and its not sending. I checked the address and no transactions is done. I have no idea what to do about it. I have the new version on wallet (2.5.6).
There are at least 2 open issues regarding this behavior on github :
So you are just hitting a bug in wallet. Best you can do is contributing to the resolution by providing precise circumstances and reproducible use case (or fixing by yourself and submitting a PR).