I don't know what suggest. It's not the first time FSCopilot prevented the Addon Manager to run, it might be it creates too many requests to Simconnect, that Simconnect can't accept anymore.
I was in touch with the FSCopilot author a while ago, and we agreed we hadn't the slightest idea why the two wouldn't work togeter. However, I found that FSX gets confused if two addons are trying to create a menu exactly at the same time, so the problem was fixed by moving to a different place of the code the menu creation. This appeared in one of the Addon Manager older release, and it hasn't changed since.
Of course, it's not a real solution because, any other addon might move the menu creation process to not go in conflict with other. It might be that this new version of FSCopilot hit that FSX bug again.
For more background about Addon Manager+FSCopilot, have a look here:
http://forum.fscloud9.it/viewtopic.php?t=4269&highlight=fscopilotOf course, the part that suggest to download the new version, is not relevant here, Zurich already comes with a much later version, that includes that modification already.