Just as a general troubleshooting idea, you could turn on message log in poser on the chance that a message is shown related to this. It's the little comic book style text bubble between the bell and library icon in the upper right. I wish the log could be sorted to show latest message on top, but you either have to scroll to the bottom or do a "clear all" on it just before you render. Click the right-pointing triangle on the Message Log header for the option to clear it.