Check if your DLL is compiled as 32 bit one. 32 bit DLL gives the same error on 64 bit Firebird. Also check if your function names are not mangled in your DLL (check it with this free tool DLLEXP http://www.nirsoft.net/utils/dll_export_viewer.html
I'm having similar problemsOn Thursday, August 24, 2017, 12:07:17 AM GMT+3, Rudi Feijó [email protected] [firebird-support] <[email protected]> wrote: I’m having a weird error, sometimes the system crashes due to an UDF being not declared properly : “invalid request BLR at offset 877 function F_GFORMATD is not defined module name or entrypoint could not be found” But I can verify it is declared properly. The same query runs without problems a lot of times (it runs every minute), but randomly it will just crash with the UDF error as if it’s non-existent/declared. 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