Only one with the issue (this issue is rare or unique). Editor works perfectly for me and most people.
Mentioning what the message said might be helpful, as we could atleast work out a cause.
It is meant to work so that initially you are displayed a liscence agreement to follow (aka own beta key etc...) and then it loads a default blank map. After the first time, it should start by loading the default blank map. In later patches or on release, the editor should also start by double clicking a SC2 map.
Errors given might be hardware related or caused by data curroption etc. We will need to know the errors inorder to help you more.