It was a problem displaying those buttons on the bar, because the plugin embedded its own version of the AUI library (js + css) in order to support some advanced components which were not supported in earlier versions of JIRA.
It worked fine at the beginning, until Atlassian updated the AUI libraries in later versions of JIRA. Then, the embedded AUI component version become incompatible causing major/critical issues at the GUI level and the buttons causing problems were removed from the bar, even the functionality is still ready behind the scene waiting for being activated some day again.
The marketplace pages for plugins have been designed in a way that the button, which leads to answers.atlassian.com is emphasized in a way that it attracts more attention than the author's contact details. That's why people usually come here, thinking that it is the prefered way to raise the issues, when the fact is that plugin authors don't really have time to sit here on answers, waiting for the questions about their plugins (not all of them, many of them do follow their plugin tags, but you get the idea..)
fact is that plugin authors don't really have time to sit here on answers
However, Answers is great and a very helpful chanel to SHARE knowledge. For that reason, me and many other vendors, prefer it rather than private emails. I've answered the same question lot of times by email. However, many times, users include the PLUGIN NAME in the question but they forget to include the PLUGIN KEY in the tag field. The plugin key is usually followed by the plugin authors and the most likely way to ensure the questions are forwarded to the right person. Furthermore, sometimes, the Answers email notifications process does not properly work.
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