Recently the All in one events calendar plugin caused an error on the plugins page in WordPress. It happened after the latest update and running on WordPress 3.8. There were a lot of people who found that they had to disable the plugin in order for the plugin area to function properly.
The fix is fairly simple. After the update, re-save your calendar settings and use the default button
Sometimes this update would cause an error. We found that if you reset to default settings, and then save the settings after that the plugin will work like before.