@Luc
because of your footer, I thought you are running Lazarus under Ubuntu as well. From what you are describing the FR5.x version seems to be very much like the FR 4.x version. Because I wanted to use the same widgetset under Windows and Linux, I started to use Lazarus with FR4.x under windows against qt like I do it under Linus Mint - KDE. For example the script editor is not working properly under Windows (qt) - its working under Linux (qt) - except code completion.
Even though the licence prices are acceptable, the support was always a problem for me. Well, since I moved to c# at work and doing the delphi/Lazarus currently only in my spare time, I can live with it. Thank you very much for your report.
Best regards - Ulrich