We found out in some situations, the MCU-100P does not always seem to work flawlessly with Panasonic AG-HPX500 cameras.
From factory MCU-100P and AD-1P adapters are shipped with the latest firmware revision (MCU at 3.2 and AD-1P at 1.4xx). This combination is highly preferred.
Still, we have had reports that some people could not establish a successful connection with a HPX-500. The reason for that is that Panasonic is using different ways for the timer for sync signals in their camera's. Also different camera firmware revisions are a factor.
If you are in the situation of a non working MCU set, try to revert back to revision 1.301, which is most cases solves the issue.
Below you can find a dropbox link for both AD-1P revisions 1.301 and 1.403.
Downgrading can be done safely.