Solutions
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Jon's post in MD-11 Elevator Trim was marked as the answerHave you looked at the system display to see if the trim is actually not changing? Also, keep in mind that there is some degree of automatic trim due to LSAS which could effect the experience of trimming the aircraft.
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Jon's post in PMDG MD11 winglet problem was marked as the answerJust a guess here, but do you have advanced animations enabled? It's under the global options section of the display settings.