Just a heads up -- on my iMac, if you quit FS 2.4.5 using the standard command-Q shortcut it may (does on my iMac) delete settings. Using the Exit button does not have this problem, of course.
Here are some of the things that change: the aircraft, location, and conditions are reset to their defaults, as are many of the control settings (although I haven't kept careful track of that). Likewise the graphics settings/quality and miscellaneous settings revert to default.
So every time my habitual tendency to use command-Q to quit any app on the Mac takes asserts itself and I forget to use the Exit button (which requires an additional button-press to quit the program), I have to go back and reset everything. So it would be nice if a future release could patch this bug.
Many thanks!