Version 6.1.2 has been released and it includes fixes for larger monitors, like 4K monitors, especially when text was scaled larger. 4K monitor presenters will now present correctly and all of the features in the GUI looks correct.
In version 6.1.2, browser-only attendees (when Flash is not available) now uses HTML5, which provies a much better experience for attendees.
Also in version 6.1.2, TLS 1.0 is now used by default, but R-HUB support can help you change your server so TLS 1.2 is used. TLS 1.2 is not fully compatiable with older browsers.