I'm not sure if anyone has reported this yet, but I was able to be invited into a boss level.
What happened was that someone sent me a invite from the depth before but I just hid the invite and did other things.
After awhile, I clicked accept and arrived in time to see the boss die and get a token.
Joining a Boss Level
Sun, 09/11/2011 - 17:24
helloxo
Legacy Username
Yep. I've seen it too.
Someone invited me at D27, they all die at D28, I joined and saved the day.
But yeh, please fix this.
I really like it and all but... Yeah.