Look in the server event logs to see if the server is having hardware problems before the wpe1 event happens. I had this problem on fm11. I upgraded to fm12 and it came back. In fm11 the web publishing engine never crashed but in fm12 it crashed twice within the past two weeks. I looked every where and nothing. I finally decided to stop the fm server and restar the windows server. Everything came back and so far no problem. the wpe warning is very hard to figure out. I wonder if it has to do with memory leakage. I am going to count the days until i get the warning again.