This PHP Warning appears in PHP Error Log with plugin version 1.4.0
PHP Warning: Use of undefined constant CE_SETTINGS_PATH - assumed 'CE_SETTINGS_PATH' (this will throw an Error in a future version of PHP) in ../wp-content/plugins/cache-enabler/inc/cache_enabler_disk.class.php on line 572
The constant is not defined anywhere in plugin code as far as I can see.
Rolling back to one of the 1.3.5 versions from 24th of July resolves the problem here.
Would suggest to test with WP_DEBUG enabled before release.
A quick Google search shows also at least another site having the same problem and it seems that site is currently down due to this problem and their setting of PHP Error output.
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