Hi
this might help anyone else if they experience similar problems
These errors are also on your Live preview
I just updated and found these errors when you click who's online button
I found these errors at the bottom left
so i checked the address url
and it says they should be png
so i fired up the FTP and looked at the files i have just uploaded and they was gif
so i edited them to png you will also need to keep the gif ones as they needed elsewhere.
and they now showing correctly