I don't have the suite so this is just a guess, it sounds like you have edited in LogonStudio editor a splash style logon. If so a splash logon is done in the UIFILE to make it work. Editing overwrites the UIFILE thus making a normal style messed up logon out of it.
but still does not show the images (bitmaps) unless I 'mouseover them'.
If you are talking about the user account panels, for standard logon only see images when click to select account, when mouseover back color and user pic will be more visible, with a splash style you should always see the user pic, then when click, for a password protected account, see password background and buttons, go, hint.
The Icons I've noticed are next to the logon names as well as the 'shutdown' button.
If I am understanding this correct, tells me that it is most likely a splash style logon. Deleted edited ones and reload them from download file.