EViews.com

I am using Eviews 8.1 but am collaborating with someone using Eviews 7. I cannot open workfiles coming from the latter version, Eviews either crashes or the following error message "internal error 504 504" appears.

Is this a common bug? Any suggestions what to do about that?

Most likely cause is that the version of EViews 7 is dodgy/pre-release. I'd have your collaborator make sure his version 7 is the latest version of 7.