If your projects just won't load up in the editor, first check that scripts aren't blocked on your computer or network.
There may also be an issue with browser cookies, especially if you're working on a lot of projects. One of the following may help:
Another possibility is that if the
.tex file you're writing on is very large, there may be lost connections due to serialisation errors with the server. One workaround is to split the
.tex file into smaller ones, and then use
\include to add them back into the main document. If you're continuing to see problems, especially if this happens to a specific project rather than with all your projects, do get in touch with your project's ID, so that we can investigate further!