I have contacted live chat support a couple of times for various issues with hummingbird. I was also experiencing several out of memory issues. Currently most of the issues are resolved but I realized that I am unable to deactivate the Hummingbird plugin as WP displays a http 500 error. Also, I have disabled the plugin by renaming the directory and I was unable to delete the plugin via the interface. I'm not sure if something is corrupt or if I just have a config issue on my server. Can you please help me resolve this?