When all of the sudden a document can no longer be created using the Create from Template Macro, then the reason may be an invalid projectdoc Doctype Cache. The page wizard can still be opened, but when the user clicks on Create, nothing happens in the user interface.

If your console log shows

404: Unknown doctype 'abc'.

Where abc is the identifier of a valid doctype, then the following procedure may resolve your issue.

Also in the client log there probably is the reference of the service

/rest/projectdoc-internal/1/blueprint/SPACEKEY/DOCTYPE_ID/metadata

with which the browser request metadata for the doctype.