To expand a little, GCE was added to core a long time ago, but no one has really maintained it. We don’t have any GCE experts (that I know of!) in the community, so debugging this isn’t going to be easy.
Do send over the logs from when you got the “Something went wrong” page, as that may be easier to troubleshoot. However my gut feeling is that this is going to require changes in either Fog itself, or in how we implement Fog for GCE. Either way, yes, it’s going to need code changes.
We should probably move GCE to a plugin and look for maintainers, but that’s not relevant to this Support issue - I will take that over to #development 