I tried to do a M-x org2blog/wp-post-subtree and got:
let: XML-RPC fault `Could not write file wpid-outline.htmlID-FDEDC9CF-EEF0-4E2D-846D-92FA799F82A2 (Invalid file type)'
is an ID being appended by mistake to the filename somewhere?
I tried to identify the relevant code in the org2blog.el source but my lisp isn't good enough.
i've isolated this to documents which have [id:] links. for now i'm preprocessing them and converting to file links, so there is no urgency on this at the moment; we can close this issue. thank you.
This happened to me when I tried to submit a post with a local link, e.g.
Just remove links of this type and everything will work fine.