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In Configuration > Development > Performance, in the Caching area, [Cache pages for anonymous users] and [Cache blocks] are unchecked. When I check them and save, the page reloads and both boxes are again unchecked. Is this wrong? Shouldn't they "remember" the state?

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    Is this a site you had total control over, or did you inherit it? – mpdonadio Nov 12 '13 at 14:55
  • How'd you guess. It's an inheritance :( – Rick Nov 12 '13 at 14:59
  • @MPD Hah, I thought exactly the same thing :) Rick, have a look in custom modules/themes for anything implementing hook_form_alter() or hook_form_FORM_ID_alter(), and see if anything's targeting the system_performance_settings form. If that fails look in the system_performance_settings() function, and the associated validation/submit handlers, and see if that's been changed by the previous devs. If you're unsure, install Hacked! to help out with that. – Clive Nov 12 '13 at 16:27
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In general, yes, the form should update with the values you set. However, there are few different ways you can override form settings.

The two in question are cache and block_cache. You need to search the files for lines that look like:

$conf['cache'] = FALSE;
$conf['block_cache'] = FALSE;

The integer 0 or the string '0' or "0" may be used instead. Checking the settings.php for the site, and any custom modules.

  • Actually this is more likely than what I said. Can't imagine why someone would disable caching except to cover up a mistake, though – Clive Nov 12 '13 at 16:29
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    @Clive User Agent detection on the server side, views w/ random sorts, and tricky invalidations are three things that complicate the standard page cache. – mpdonadio Nov 12 '13 at 17:02
  • Yeah there are plenty of valid use cases for having cache switched off, but doing it in such a way as to disable it being turned back on again is a new one on me – Clive Nov 12 '13 at 17:22

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