Several people have noted that PandoraBoy is displaying a “Profile” window over the player that interferes with the player. This is a notification from Pandora because they’ve changed their privacy settings (you can now make your profile private, and they want to know if you want that).
This should be a one-time event for existing accounts. I suspect that new accounts will not see it. The solution is to open www.pandora.com in Safari, answer the question, and then re-launch PB.
BTW, I often am asked why PB doesn’t make the window resizable for cases like this. The answer is that it doesn’t help. The mini-player is a flash app, and has a clipping frame independent of the window. So while you can resize the window, the content is still clipped at the border of the flash app. Ah, the wonders of Flash.