When compiling to the following formats, Scrivener 2.9.0.22 Beta throws a “Could not convert to required format - Unknown error” dialog, and compiled file fails to be created. The formats are:
Multimarkdown > HTML
Multimarkdown > LaTeX
Multimarkdown > Flat XML
My workflow unfortunately relies on being able to export to Multimarkdown > HTML, so I have to downgrade for now. Looking forward to being able to use the beta this is fixed in