Join Date: Feb 2006
Location: Canberra, Australia
Bikes: Salsa mtb * 3, Intense mtb * 1, Abeni SS rd * 1, Salsa road/touring * 2, Trek Damn one * 1, Vintage/projects * many
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A common reason for this type of suspension adjuster to stick is that it has been turned and jammed all the way in or out against a stop. If this isn't the case, the knob might need to be removed and cleaned out, then re-attach and try to turn the shaft.
Most likely though, an internal part has seized or broken and it needs to be returned to the service centre.