I can declare the UDFs from IB_UDF and they work fine until I close
the database. After I restart the databse, the UDF definitionis
still there but SQL SELECT, etc. cannot find the UDF entry point. I
get a message sayin ISC ERROR CODE 335544343.

Invalid request BLR at offset 8. Function SUBSTRLEN is not define.
Module name or entry point not found.

I have placed the UDB.DLL in many locations. FB/UDF, FB/My
Application Folder, and WINDOWS/SYSTEM32. Nothing helps.

How do I get FireBird to automatically reload my UDF declaarations?

Thanks.