Dear Group,

We have an application written in C that calls the API. It has been working correctly with an old FB 1.5 database. We have upgraded the database to FB 2.5 and recompiled the application.

Now when we run the application the first API call succeeds,

isc_attach_database

but all subsequent API calls all fail with

invalid database handle (no active connection)

and finally the application memory faults.

Does anyone have some advice as to what may be the problem or how I should start debugging it ?

yours sincerely

Anthony.