As far as I can see the cache check is done by checking whether the file exists, there is nothing done in a database at all. The cache checking is done in the function modify at the lines where it checks the settings for usecache and then calls up $this->hasImage(...) On EZ 3.8.3 the line numbers are 234 and following. If I understand you right EZ thinks that there is a cached file so it might be a good idea to check the filepath that is checked in the hasImage function.
Could you also please post both paths - the one where the file should be cached and the one where EZ thinks it is cached. You should see the path in html files that are created.
Greetings from Luxembourg
Claudia
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