I find this happens to me sometimes and the problem seems to be that the images are loaded from a different site (i.ebayimg.com) and there is an issue with the certificate for that site.
There' an easy temporary fix.
All you need to do is go to https://i.ebayimg.com/ and accept the certificate error.
This will mean that the website may not be secure, so if you care you shouldn't do this. But it's just Gumtree, not online banking, so why would you care?
To accept the certificate error in Internet Explorer1. Go to https://i.ebayimg.com/
2. Click "Continue to this website (not recommended)"
To accept the certificate error in Google Chrome1. Go to https://i.ebayimg.com/
2. Click "ADVANCED"
3. Click "Proceed to i.ebayimg.com (unsafe)"
Ignore the message you see after this, as it isn't a valid page. You can close this page.
Then go to www.gumtree.com.au and ad photos should now load.
If this solved your problem please leave a comment or use one of the social media like buttons below to let me know that I'm not the only one suffering this problem.
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