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The only thing I changed is that I added output from some resources

This is strange, since the preview showed no changes. If you don't mind, can you run with `pulumi --logtostderr -v=9` and share the resulting logfile?  (Only do this if there is no sensitive information in your config, this will dump lots of info, obviously not your AWS creds though.)

(feel free to email it to me at <mailto:joe@pulumi.com|joe@pulumi.com>, or share a Gist if no sensitive info)

Closing the loop here - after an offline email follow-up, this turned out to be due to <https://github.com/pulumi/pulumi/issues/1596>. 

I'll follow the conversation in the issue, thanks Luke