We recently had one of our clients ring up telling us one of the buttons in their admin interface had gone missing. As we had just added a couple of plugins (after testing on a development site of course) there were all sorts of mutterings around plugin authors and their programming practices, however, it turns out not to be a plugin issue after all, but rather a core Magento issue. After some delving around I found that a plugin (that had been in place for some time) was all of a sudden trying......

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