I already submitted a bug report on this several days ago, but it is getting more of a problem trying to build a project.
As long as we only have one slide, no problem. When we add a slide (new or clone), the second slide shows a diagonal line going through it and we can't publish the project (we can still publish the 1st slide's content).
Unlike it says on the "Publishing Troubleshooting" page, we still have a connection to the LF1. We can still stream content from the publishing disabled slide.
We tried restarting the LF1 with no difference.
When I submitted the bug report on this, we had added slides, deleted some, and then couldn't publish anything at all. I don't know if we deleted the 1st slide or not, or if we could still publish the 1st slide (like now) before we started deleting slides as we weren't paying attention while streaming/testing until after we had deleted slides.