I recently installed Hummingbird and network activated the plugin. Once I did that I was not able to get cornerstone, which is the X theme's built in wysiwyg option much like VC, to work.
This is not a huge issue for me since I realized what caused it and I have deactivated hummingbird for now.
I notice that some of it's features are still available in "the hub". What is the difference in using the plugin and just using the performance section in the hub?