Did you upgrade or installed a newer version of Firebird over an older one? On my machine I installed a newer version over the older one, and it installed the new version in a subdirectory under Firebird, but the old
UDF folder was not removed. I ended up with the following structure, which lead me to putting UDF dll's in the wrong folder:

C:\Program Files\Firebird\UDF <= old UDF folder, not used by my Firebird 2.0
C:\Program Files\Firebird\Firebird_2_0\UDF <= new and correct UDF folder

Note that this situation is specific to the way I upgraded and your folder
structures may look different. Just ensure that the UDF folder you are using is at the same level as the bin folder containing the version you are running.

Regards,
Christo
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