Since this has already happened to 2 different plugins from different authors, it should be noted that spaces, special characters etc are NOT allowed in the name attribute
<PLUGIN name="&name;"
Spaces etc worked by accident on versions of the OS < 6.10, but when on 6.10 this will prevent the GUI from displaying the current update status of the plugin
Additionally, the filename of the .plg, the folder it's stored in within /usr/local/emhttp/plugins) and the name attribute should all be the same for best results on the system