XF 1.5 Some images not displaying to some users...

First thing to do is have those users check their console for any errors (developers console). There will be a reason that the image cant' be displayed shown there.
Are you using a CDN of any type by chance?
 
He needs to show ALL errors... at the least it should be a 404 error showing in there.
Needless to say, this needs to be done when the images are not able to be seen.

I have seen similar issues happen when a firewall restricts the concurrent # of connections to one IP.
 
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