@ Enrique
Sorry, I was telling you to put the blank index.html page in the wrong folder. It should be this:
../wp-content/plugins/connections/cache/
Wait … Ok, I just checked. The file Connections load in that folder is in place like it should be. What is the permissions on that folder? Try 767 as well.
Now it seems there is another javascript error. That one was not there when I last checked. This time it is with the plugin Visual Form Builder Pro. I’m not familiar with that plugin but it does seem very well supported. You might want to ping them for help on that error. But for now, can you temporarily deactivate it?
I hope you understand the javascript in other plugins is not the fault of Connections. Those errors will/are actually causing other plugins to fail too. the results just are not as visible.