<p>1. I have Pegasus Mail configured to use system defined colors. 2. My default background color in Windows, and consequently in Pegasus Mail, is not white. Until 4.51, this worked fine. However, with 4.51 it only works fine until I open Pegasus Mail Help. In the Help window, the right hand part of the window with the information, and the contents list in the left part, have the correct background color. However, below the contents list, the color is always white.</p><p>And during and after using Help, suddenly the Preferences and Settings looks the same: below the list of settings, the color is white. The rest of the window retains the correct background color. The Folders, Filter rules and System messages windows have this behaviour too. </p><p>The windows of all mail folders, distribution lists, addressbooks, identities and notepads are unaffected.</p><p>But the windows of public folder trees, content control, IMAP profiles, the Draft Manager and the Queue manager get a complete white background.</p><p>After restarting pmail, the white areas are gone, and have the right color again. But as soon as Help is started, the white areas are back.</p><p>Disabling and enabling "use system defined colors" removes all white areas at once, even in Help, but after restarting pmail and help, the white areas are back.</p><p> If other users can confirm this strange behaviour, I think this is a cosmetic bug in Pegasus Mail and/or its new Help system. </p>