Maybe it's off screen? Look in MQ2PluginMan.ini for the server.char you have issue with.
If you need to, unload the plugin on that char: /plugin MQ2PluginMan unload
Then in the ini, delete that char's section and save.
Then load the plugin back on that char: /plugin MQ2PluginMan
If needed: /reloadui
Use /pm to toggle it