On 10/18/2016 10:59 PM, captaindet wrote:

It's not a known issue, but i will take a look.

thanks, much appreciated

I found what is causing this:

gtk.Builder uses glib.Module internally, on win 64 gmoduleopen fails
to load so we are calling a null pointer. In the 64 bit copy of Gtk this
function is named gmoduleopen_utf8 for some reason.