weird....
what I did was :
run amulecmd (like I said, amule version is 1.2.5), Show DL, then try pausing a random download, then check if anything has been paused at all, and then resuming it. Then pausing it again, shutting down amulecmd, running amulecmd again and trying to resume the file using the same number as before. And it worked. (Not that it helped at all, but ...)
Still, some numbers would have no effect on the list, no matter if i used pause or resume. (and no, i didn't get the Out of range error)
?( either the amulecmd gets more buggy with each release (or feature-rich as micro$oft would call it :] ) or something is really wrong here.
edit: corrected some typos