With the latest version of Adobe Photoshop CC 2015 there appears to be an issue with the sixth entry of plugins from the Filters menu.
If the ON1 category shows up sixth in your list of third-party plugins, the plugins will fail to launch.
And trying to relaunch the plugin again, may cause unusual behavior.
This problem will also occur with any other third-party plugins that are installed that may show up in the sixth position in the list as well, and is not unique to the ON1 plugins.
The workaround is to remove other plugins not being used, so ON1 does not show up in the sixth position. Or add additional plugins.
Adobe is aware of the issue, but we do not have any information as to when an update to address the problem will be released.