Here is a post by CaySal Lackey who’s an rising XPages developer but is losing dev time to problems with the Notes Mac OSX client not being able to open and properly use 14 year old basic Form and View based databases.
https://caysal.wordpress.com/2016/03/20/notes-9-0-1-64-bit-for-mac-open-database-issues/
If anyone knows anything that can help her please post it on her blog.
Thanks!