this has come up many times....
http://eab.abime.net/showpost.php?p=600873&postcount=14
http://eab.abime.net/showthread.php?t=34651
seems not to be anything to do with PUAE (or any other UAE)
I know this doenst happen in the JST - perhaps if someone could persuade JOTD and Psygore to compare their sources...