I'm having a problem with an application that uses several dialog boxes. On my XP machine everything works great, but if I run the app on a Win98 machine the dialog boxes show up with no background and no caption, only the controls are visible. What could the problem be?

you are probably using controls and dialogs that are not supported in Win98. Read the system requirements in MSDN for the dialogs/functions you are using. For example, is your dialog using UNICODE strings? If it is, then it won't work in Win98 because that os does not support UNICODE.

The dialog contains two button controls, an edit control, and a static text control. The same dialog in a program compiled with a 16bit pascal compiler works fine. Why wouldn't it work with Delphi?