The Foundry for Star Trek Online is currently unavailable. The team is aware of this and will provide updates to this thread as they become available.
UPDATE #1 (1:37pm PDT): This applies to both editing and playing Foundry projects.
UPDATE #2 (3:09pm PDT): The team is working on bringing the Foundry back up. Our current ETA is 7pm PDT but this can change to be earlier or later. Thanks for your patience.
UPDATE #3 (7:30pm PDT): Our new ETA is 8pm; again, this can change to be earlier or later. Also, read this post.
UPDATE #4 (9:08pm PDT): The Foundry for Star Trek Online is now available for use, including both the editing and playing of projects. If you see any irregularities with any of your missions (which you shouldn't), please send me a PM with your mission name, project code, and what's wrong. I will not be able to respond to PMs, but I will pass along the information to the team.
Right, as is, when you are in the Foundry, you're cut off from the rest of the game. Seeing as I can talk to people in Champions Online from Star Trek Online, I do not see why it would have to be that way.