Yes I did notice the reference. Although I would have preferred to write IM with use of objects, I specifically did not use those functions to remain downwards compatible. And although I did not check all PHP functions I used, I am pretty sure that I did not use any functions that are not supported in PHP4.

Meanwhile I did some rewriting in the IM functions, related to paths and rights, and it would be worth trying that out.

Of course migration to PHP5 would rule out possible causes too.