> Is 4.7 not intended to be compatible with old apps?

As much as possible, yes, but due to some of the changes in FB 2.0 certain
changes had to happen in IBO that preclude backwards compatibility in some
aspects having to do with the use of relation alias names becomming
significant when before they were very much ignored. This was actually a
very needful change and only resulted in the need to improve one's code to
consider them with accuracy and consistency. Relation alias names were only
used in the SQL and nowhere else but now they are fully integrated into all
the various properties of IBO so that 100% accuracy is possible now. This
was not possible until Firebird 2.0 created the means to have the relation
alias information returned via the API.

Jason