Thanks for a quick update. I'm in the middle between blest and other billing and seems I have some time to wait till release of 4.0
dev.blesta.com - apparently it doesn't work under Safari (OS X). Under chrome works like a charm.
https://www.dropbox.com/s/ah4bmpirepn7keu/Screenshot%202016-04-07%2018.40.50.png?dl=0
Issue confirmed from second OS X device.
Might be you have some ssl cipher settings at your Server: Apache-Coyote/1.1