5
well they're notices so no harm.. it's not XOOPS fault either, XOOPS don't recommend php 5 anyway and those errors are php 5 related, & php 4.4 related i believe, because the new versions of php changed the way variables work..
so blame php not xoops. it'll be addressed in next versions more than likely..
but enabling php_long_arrays in php.ini i think will solve it. in php versions less than 4.4 long arrays was enabled by default, in newer versions it isn't.. or something to that effect anyway.