Yeah, I've done that too .. open stuff and arrange windows, use a different system and now things have suddenly disappeared .. because they were on a second monitor that is no longer available.
It's very annoying at work; open apps, set up screens, then remote in later with different system .. more than once I've ended up with icons in the taskbar I couldn't resolve/access until I logged in from a different computer ..
caveats
Ain't just RB in this respect ..

I do not work here, but the benefits are still awesome
Make your sound your own!