Hummingbird breaks site and revert is not working

They just changed the staging site at from to so not all the plugins are showing up in the list above?

Anyway, trying to get rid or combine JS and CSS. Using Hummingbird but kills the site and the revert is not working. Should we use JS & CSS Script Optimizer plugin instead?

Hummingbird warns of it crashing sites and does not tell us what we should choose safely.