So I am having an issue of Prepar3d closing when I try to program the FMS. What is weird about this is it has happened not only with the 737-300 but I am also having this issue with the 757 and 767 as well and it always happens at the exact same point. When I am in the VNAV Descent Mode Menu it defaults with 240/10000 on L3 SPD Trans if I go to put 250/10000 on the SPD RESTR L4 it will not let me do that. So I tried to update L3 with 250/10000 upon attempting to put that into the FMS the sim freezes and closes / crashes to desktop. What is weird is in Windows event viewer I do not see any errors related to this and all I see is (not sure if related or not) is an information message for Microsoft-Windows-Security-SPP... I have observed this phenomenon multiple times prior to reporting it here and in three different CS addons (73,75,76) Any ideas as to what could be causing this and or how to fix it? Thanks