After installing SDK 1.5.7

…I cannot get my custom scenery to load. Trying to load up the custom scenery into DevMode for editing generates the following error multiple times in Console:
”Asset group XXXX_ModelLib is outdated. This may break compilation!”
Additionally, one of the custom models I created in Blender is flagging as not usable.
I guess my first question is how to bring my ModelLib asset back into date? Am I going to have to delete the custom model (a 12” high taxi light) from the project before retrying the build?