Ok, did a shitload of testing.
First disabled all other scripts, pre cache etc.
then trying nuking in all sections..
reverted to ioa 1.06 and same thing now...
back to ioA 1.07 and went though whole config... no errors there.
then downgraded to ioFTPD 5.5.6 and nuke worked in all sections but date masked sections.
then back to ioFTPD 5.4.3 and nuke works in all sections
conclusion: I'll stay with 5.4.3r for a while
