Hi Al,
Do a search of recent posts - over the last two weeks. Unfortunately I cannot remember the best keywords, but try XMI or XML.
There was a very recent problem report, somewhat oblique, that might bear on what you've experienced. One of the Sparxians answered, then after a user post corrected himself and agreed the problem was real.
The problem has apparently been resolved in either build 812 (the current beta 3 of EA 7.0) or the next build, I am not sure which.
In any case try the search, and see if the above-mentioned thread addresses your problem. Otherwise, watch this thread for updates. Remember you can set an option to email you whenever another post is added to the thread. If you don't get a resolution in the next (very) few days report a bug to Sparx directly, so that the issue is resolved before EA 7.0 goes to production. For a direct bug report you can use the Support link at the top of a forum page, then the Bug Report link in the left side menu. Or, from the EA main menu choose Help | On-line Resources | Bug Report Page.
HTH, David