There are many instances where a upgrade seems to have failed because the images were not loaded correctly.
Just curious. What web server are you using? Apache, EPG, or APEX Listener?
I know it's not APEX listener. I am assuming EPG based on one of the scripts Oracle support had me run--apex_epg_config.sql. Note that this was run after the fact and things were already messed up so it did no good. Needs to be run during the upgrade instead of apxldimg.sql according to the latest from support.