[SOLVED] by enabling animation on screen change
Version 0.5.11a / Win10 / Fresh install
Not able to access [Mansion Upgrades], the button is clickable but nothing happens (I neither get an error).
If you haven't tried it in my case that bug was tied to disabled animation in options.
Just go into settings and try to tick option Use animation on screen change.
In my case its 100% reproductible just by enabling and disabling that option.
My harem and I are thanking u, kind person, as from now on I can upgrade the bed capacity again. ^^