Fixlet Debugger Local Client Evaluator not Communicating

When I use the local client evaluator on one of my clients, it returns the following error.

Error: An error occurred while communicating with the client.

The client was working and then it stopped. I removed the BES client and reinstalled it with no change.

So you are running the Fixlet Debugger (I presume the same version as the client) on the machine and the client errors? This would be unusual but it could be because the client is very busy?