I’m also having this same issue, GD support should be installed and enabled on my host. It still creates full-sized images instead of thumbnails. The only feedback I have at this point is an warning after enabling debugging mode:
WARNING: CALL_USER_FUNC_ARRAY() EXPECTS PARAMETER 1 TO BE A VALID CALLBACK, FUNCTION ‘BE_FOOTER’ NOT FOUND OR INVALID FUNCTION NAME IN /HOME/CONTENT/
