Image caching

[Seeker-Smith]

I'm seeing lots of broken image icons when I go to a post with thumbnails (20) also on the portal (20). Is there a time out for loading option or a caching option I should be using?

I have my VB production site on the same host as my test site with MyBB 1822 and the VB site has no issues like this. I have 265,000 images so its kind of important to deliver thumbs without errors.

Yes I do have caching on but zlib.output_compression off.

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A bit more info. The VB site is running php 5.6 and the MyBB was 7.0 I've just updated to 7.3

[Ben]

Have you checked your browser console error logs?

[SvePu]

I'm caching attachments with .htaccess

<IfModule mod_headers.c>
    <FilesMatch "^(attachment)\.php$">
        Header set Cache-Control "max-age=2628000, public"
    </FilesMatch>
</IfModule>

[Seeker-Smith]

Yes and each broken thumbnail is a 500 server error.

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Have you checked your browser console error logs?

I'm caching attachments with .htaccess

<IfModule mod_headers.c>
    <FilesMatch "^(attachment)\.php$">
        Header set Cache-Control "max-age=2628000, public"
    </FilesMatch>
</IfModule>

Yes this works second time I hit the page. The images load instantly that were cached