Just some general info to add to @Thunderbird8's input:
See ... /includes/class_bootstrap.php #397 (relative)
This is where $cronimage is defined. In using various external 'caching' methods, I have come across what @Thunderbird8 was referring to.
Since each external caching system works differently, exempting this from the cache can get a bit tricky and sometimes modification of this line of code is necessary.
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