The /tmp/pear/cache/PEAR-1.9.0/ was created by the pear itself when i've upgraded it from 1.6.1 to 1.9.0. I thought it worth a try to upgrade, because the problem was there with a v1.6.1 too. Anyway, renamed it, still dont works.
Where can I check the include path ? in the /program/include/iniset.php ?