Key change not correct in only some parts
I made a Big Band arrangement with a Key change (at [E] in the score). The score showed the correct key for each instrument but when the parts are created 3 instruments had the old key signature instead of the correct new one. Since this is a global function there is no direct way to correct the individual parts. In this case Trombones 1 and 3 and the Guitar show the wrong key change although the systems after the key change show the correct key.
I don't know how this occurred or how to replicate it.