You’re sitting in your cubicle at 2:59 p.m., when suddenly everyone on your team rises and heads to the conference room. You’ve got nothing scheduled and received no urgent emails, so you ask where everyone is going only to find out your boss called a meeting for a project on which you're working. That leaves two options, neither of them very good. Either 1) your boss genuinely and mistakenly forgot to invite you, or 2) you were excluded on purpose. While the latter is obviously worse, if you’re so forgettable to your boss that you slip his/her mind for a simple meeting invite, that’s not a good sign either.
SOLUTION: At the earliest possibility, approach your boss directly and ask him what happened. It might just have been an honest mistake, so avoid being confrontational or emotional about what happened. But if it was intentional, be firm about your need to hear from your boss what problems exist in his/her eyes. Stress the fact that you can’t do your job effectively if you’re not privy to meetings and the most current information.