I was using Alt.Binz 0.39.8 and I received this error when trying to disable/remove some NZB Search Engines from the toolbar. Alt.Binz did not crash, just gave the following error
To reproduce this, go to the toolbar, right-click, Tabs, and disable one of the NZB Search Engines. The only time I didn't get the error was when I disabled the RSS tab.
Running Windows 7 Enterprise SP1, Corporate firewall at work