I can confirm that this has happened to me twice and I know of one other player on the site that told me it happened to him as well.
It is highly likely this is a software problem that only shows up from time to time on certain platforms (OS). That may be why it hasn't been widely reported.
1. Logging out and logging back in at a critical moment costs you to lose chips and time, so it's not a reasonable option.
2. The best indicator this is happening is when you see a call amount that indicates a raise, but none of the visible players is showing a raise.
3. If you have the stacking console enabled, you can see the action line by line. In that way you are less vulnerable to the "invisible player" software glitch.
4. It is best to avoid action as long as possible till you can get to a break when you can log out and log back in.