The problem I'm encountering is very easy to reproduce:

Just make an new application with a TIBODatabase, a TIBOStoredProc and
a TButton component. The SP must point to a FireBird-SP with input
pararmeters. Give the parameters a value in the BeforePrepare-event of
the TIBOStoredProc and execute the SP with the TButton. That will give
a "Stack overflow" because it is called many times!?

If you give the parameters a value in the AfterPrepare-event then all
goes well.

If I use version 4.2 all goes well also.

tia,

Gerard

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Gerard J.M. Houtenbos
DoubleWood Software