The settingsfile plugins\Config\NppMarkdownPanel.ini isn't used anymore after changing the internal plugin name to MarkdownPanel.
Version 0.7.2 trys to load the settingsfile MarkdownPanel.ini , which doesn't exist and creates a new settingsfile with initial settings.
The Plugin should use the old Settingsfile plugins\Config\NppMarkdownPanel.ini, even if the plugin has a new internal name.