All of a sudden the delix plugin doesn't work anymore!!

Formats that were working perfectly (e.g. Lionheart's sa.* files) now won't load and return: "Can't extract .dat file!", "No interrupt entry!".
Obviously the plugin is correctly installed. I have XMplay 3.5.1.
Please help! I'm desperate without my Amiga mods!!
EDIT: just tested with the old XMplay 3.4.2 from
http://support.xmplay.com/file.php?cat_id=7 and they work again! New XMplay 3.5.1 isn't compatible with latest delix beta plugin!

Looks like v3.5.1 can't extract the .dat file anymore!