Livejournal Crossposter with WP 2.2.1

I’ve successfully used the Livejournal Crossposter with older versions of WordPress, but now I’ve just upgraded to 2.2.1, and whenever I try to post an entry, I get the following error:

“Something went wrong – Client : Application failed during request deserialization: not well-formed (invalid token) at line 11, column 499, byte 1110 at /usr/lib/perl5/XML/Parser.pm line 187”

One funny aspect is that when I post small entries for testing purposes (with only “testing” or “this is a test” written as content), it’s perfecly published on LJ!

Does anyone know how can I fix such thing? And if not, is there any other plugin that does the same crossposting work?

My version of the Livejournal Crossposter is the 2.0.

Thank you!