Wow, thanks for the kind words Jesse :-)
About the about box, I've investigated the case and come to a conclusion that the error message appears only when I compile the project so that it doesn't need C++Builder specific libraries. All functions like ShowMessage, InputQuery,... give this error. No idea why. Now I simply removed the Info item from the Menu, it wasn't very helpful.
As for the form visible when starting, on my machine it doesn't appear, no matter how I compile the project, but I corrected it (in a Left=-500;-like way but for me it works
(New version posted in the first post.)