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On OpenLAB ChemStation (C.0x.0x), this issue is usually resolved by resetting the instrument configuration files in the instrument folder (\Chem32\X\, where X is the number of the instrument in question).
Turn off all sessions (online and offline) of ChemStation, then append .old to these files:
Start ChemStation again and the problem should be resolved.
This fix was also posted in the Agilent Community here: https://community.agilent.com/docs/DOC-1637
Thanks for confirming this resolved the issue!