>> 4. Or it may be the case that the blobs are being stored correctly, but
>> the size of the client buffer that is being used to accommodate query
>> output is limited.
>
> I've used several different methods to verify whether the contents have been
> truncated. Both Qt and isql show the truncation, so I'm rather sure that it's
> not simply a selection buffer problem.

Did you use BLOBDUMP command (in sql) to verify stored data ?

Ivan