>Hello, Richard
>
>Are you getting a "Page not found" error? If so, right-click the file and make sure security isn't blocking the file in some way (read permission isn't denied, etc.) I've had this same error before and I don't remember off the top which setting it was, but as soon as I switched the setting it started working again.
>
>Hope that helps,
>

There was some change in the security handling of help files. I get the same errors on CHM files that are on our network drives. Copying them down to my local drive fixes them. There is some KB article about this somewhere, but I've found copying local to be the quickest fix.