I have some problems with the struct plugin:
In my wiki, I have defined footers (plugin footer) for certain namespaces, each containing special aggregations of the struct plugin. I do this because then I can use placeholders like "@NS@" or "@PAGE@" in the footer of the namespace in the filter definition of these aggregations. So I have a kind of templates for specific namespaces with aggregations based on the specific struct parameters of the page. Sounds complicated, but it's actually quite simple.
Usually it works perfectly. But sometimes - I don't know exactly when it happens - the footer is not displayed anymore. The only way to solve this is then to clean up every single page with the command "&purge=true" (unfortunately "stale" doesn't work either).
So until I have a solution for the cache problem when using the two plugins "header" and "struct", I have no other choice but to purge all pages in the affected namespaces when the problem occurs.