That's just the generic window without the "Plus! skin" applied, just like the contactwindow doesn't have it's own skin applied either. This happens with almost every skinned window that hangs, like lizard.boy said, nothing special.
The window title being different from the skinned window title isn't strange either. The title you see when Event Viewer hangs is the internal name of the window which Windows uses the identify the window. You can see that with your own eyes:
- Open the Plus! Event Viewer
- Press CTRL+ALT+DEL to open Task Manager
- Go to the Applications tab (first one)
- You'll see "Event Viewer - Messenger Plus!" as a running task (or in your case the Turkish version.
The same thing goes for almost every Plus! window, the internal window title is different from the skinned window title in a lot of places. It has nothing todo with using old code from Plus! 3.x, i think it is done this way because the internal window titles are easier to identify in your taskbar when only the first part of the window title is shown.
And please resize your images: