And yes, I agree, that talking with the agent is best. But I do sympathize with this person. We spend so long trying to get an agent it's hard to get over the feeling that you should walk on eggshells to avoid doing anything that might make them angry. No one wants to find themselves scouring through AgentQuery again. (There was a recent post on a message board from a member who is a client of a well-respected agent who has been ignoring their phone calls and emails and requests for updates for months. And rather than being thoroughly pissed at this treatment, they're still worried about offending the agent.)
It's simply not acceptable for your agent to ignore you. I'm as guilty of this sometimes as the next agent, particularly when I'm busy on things with looming deadlines or I just don't have much news to report, but it's still NOT ok for your agent to ignore you.
Saying it's not ok though doesn't make it not happen. Here's what you need to remember. Agents don't want to lose clients. You're our source of revenue. If you're unhappy, you have bargaining power. You obviously can't threaten to leave too often and you can't use it with minor matters. But if you are seriously wondering if your agent is dead cause you haven't heard from her/him, don't accept that as a writer's lot. It's NOT.
There are worse things than looking for a new agent. Having an agent who doesn't treat you with the respect you deserve is one of them.
***I'm mad as hell and I'm not going to take it anymore!