Not sure what you mean with "reloaded a character action using the PoseManager plug-in". What is a character action, and what does it in detail?I turned off Region Enabled in the belly menu in the FlexIt module. When I reloaded a character action using the PoseManager plug-in, it turned on automatically. I had to keep turning off Region Enabled. I wonder if this problem can be fixed?
Changing the appearance and loading a pose preset does nothing to my settings. Does PoseManager reload the plugins? If so, the values would be set to default, but all of them, not just the Abdomen toggle.
Try setting up a Flexit preset called "UserDefaults" (exactly like this) with the abdomen disabled and any other settings you might like. This preset will get loaded whenever you load or reload ShakeIt. A message should be printed in this case. Now, if you load an action with PoseManager and you see the message, you know what the error was (plugin got reloaded). Your settings should now be restored though.
If my assumption was true, you should contact the author of PoseManager. It really isn't a good practice to reload any third party plugins, and even less if it happens without the user getting informed.
Pls let me know if the issue is resolved.