Problems setting breakpoints, workspace issue?

Had a previous problem setting breakpoints in E2Studio 3.4.0 where scalability settings made the option unavailable.  Fixed that problem, and it worked for a while, now suddenly something has happened where I can set breakpoints, but they all have a "\" through them.  It won't stop on any of them.  Tried clearing them all, same thing.  Other workspaces are working though, so it's not the Jlink or the board.  I did try creating a new workspace and importing the project, now it seems to be fine.  What could have happened to the workspace?