I used Delphi's FireDAC components and FireDAC Monitor program which tracing issues with Firebird. I posted  extracted data from tracing file after user hit save button to save changes in address1 line - it's very simple transaction which failed in Firebird 3 and has no problem under Firebird 2.1. I also used IBExpert to do the same thing - set Address1 to some value and save it - it's works, but not when I run application. I don't know what was changed in FB 3 to break the working code. Obviously something new added to environment but I don't know how to tune my program (connection properties, table parameters or something else) to be able to save data properly.

Thanks, Fred