I have found this to be caused by the fact that my schematics do not correctly link the nets across multiple pages. Check if your scope is set to Ports & Net Labels and/or make sure your nets are clearly marked on all relevant pages. The overall block diagram using sheets is useful here as well.
I had that one once too.
It turned out to be a not-so-obvious typo in the net and port names that prevented P99 top correctly link the nets up.
Found it by checking the 'add sheetnumber to local nets' checkbox in the synchronizer....
Leo Potjewijd hardware designer Integrated Engineering B.V.
[EMAIL PROTECTED] +31 20 4620700
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