Are you waiting long enough for RH to load the project?
If you look at the Performance tab on the Task Manager, do
you see activity, or is everything flat?
Is RH displaying a message in the status bar, such as
"Loading topics" or "Updating hyperlinks"?
What other applications are running when this is happening?
For example, our network people pushed anti-virus file updates
until it became an automatic push when we first log in for the day.
Still, the network kicks off a virus scan on a schedule during the
working day.
A housekeeping file, projectname.hhp, may be corrupted, but
you'd think it always would interfere, not just sporadically.
I know Colum and Peter don't need to be reminded -- but since
dwbern is new to the forum --
Have you moved any files into the project folder, or from one
subfolder to another, in Windows Explorer? With the project running
in RH, or with the project closed? Running or not, this confuses RH
next time it goes to look for those files. Same for changing file
names. Except in very limited circumstances, you should consider
the project folder a read-only reference.
Harvey