There are a few reasons for this to happen....
1. In some cases, the FPA is monitoring using the investor password. If that password changes, then updates can't happen.
2. If it's a demo account, those shouldn't expire. Sometimes they do.
3. Some new bots never lose a trade. They also never win, since they don't open any trades. This can be a compatibility issue with the FPA's Linux VPS. Some EAs won't work with any VPS. Sometimes, reviewers report the same issue. A certain percentage of EAs just don't work.
4. Every now and then, a test gets "stuck". When that happens, it's still running, but the updates don't post. Then the guys in testing need to give it a kick to get it to get it updating.
If there's a specific test that's not updating, use the "Contact Us" link on that tests page and someone here will check on it.