First of all, I would like to thank you for Your kind help I really appreciate Your guides. I have followed Your instructions (even before I have started this topic, since I do tried to solve this problem by myself ), but I haven't found any extentsion that would appear as relevant. In fact in PHP 5.0.4 archive, I have received only those extentions that are commented in UniServer's php.ini file. However as I have mentioned before, during my research on web I have found a description of a bug concerning T1lib, that is : http://bugs.php.net/bug.php?id=32809 The last comment over there is: " This bug has been fixed in CVS. Snapshots of the sources are packaged every three hours; this change will be in the next snapshot. You can grab the snapshot at http://snaps.php.net/. Thank you for the report, and for helping us make PHP better. T1LIB support is now available on Windows." So I have also downloaded this snapshot and as I have compared those two versions PHP 5.0.4 and 5.0.5, there is a significant size diffrence in php_gd2.dll file [792kb to 916kb]. It seems to me that having a newer version of this file in PHP 5.0.4 might solve my problem (but it's just my guess). However, as You have pointed this out in some other topic of this forum, mixing the files from two different compilations is not possible (what i have also checked, just for experiment sake - and definitely You were right ) As such my conclusion is: migration to PHP 5.0.5 might help. Unfortunattely my skills fail in this matter. If You could help me in this matter or maybe find another solution