https://bugs.winehq.org/show_bug.cgi?id=22160
--- Comment #13 from Robert Wm Ruedisueli ruediix@gmail.com --- Wine-Mono still won't load the launcher at all. (One of the embedded browser functions is missing, and the bug fix is in "cleanup" stage by the Wine-Mono developer.)
However with .Net installed, only the (rather useless) homepage panel is missing it's rendered page. This is likely due to an incompatibility with Wine-Gecko MSHTML emulation.
All other functions work fine when .Net is installed (other than a little instability here and there.)
This means the issue is likely isolated to Wine-Mono.