Aileron Jack Stall
Flight testing of the RAAF's F-86 Sabre included finding the corners of the manoeuvre envelope where the aileron hydraulic actuators/jacks stalled. This occurred at speeds in excess of Mach 1.0 during rapid aileron actuation. The stick would lock up at about half deflection and could have been most embarrassing in a combat situation.
The hydraulic system was designed with a pressure of 3,000 psi and there was no way to increase the pressure without major changes. Higher power jacks were considered but discarded.
The manoeuvre limitation was accepted as insignificant considering the infrequent excursions into the situations where it occurred.