Hello jack, may be you have a problem with the metadata of your database, that were compatible with interbase 6 but not with firebird. Firebird is more strict than Interbase was. I had problem in the past backing up interbase 5.6 and restoring in firebird.

The problem was solved, extracting metadata source and creating the database in firebird from metadata source. In that process I found some problems that let me correct the source database.

I think that you would try to extract metadata source, create the database in firebird from that source, and then pump data from source to destination database.

If I were you, I would have done this when moving from Interbase 6 to Firebird. I did it and have not had problems.

In the process of database creation in Firebird from metadata, may be you will find the problem in your source database.

Good luck

Jesus Angel Garcia Zarco