Hi, is the issue only when HMWP is active? Are you using any plugin for displaying photo/image here?
Also, generate debug report from HMWP start tab and post it here as private reply.
Can you please try emptying out “Ajax URL” field under HMWP permalinks & urls tab?
If it’s still the issue then please let us know your website’s wp-admin login details (as private reply), so that we can look into it further.