@smallg
Forget the crates, picture a shack model that needs to be revised.
Yes. I am showing separate meshes within the same entity. To begin with the entity is created in my modeling software and saved as an "x" file. The entity is then placed into a map created in MAX and then the map is saved, tested and everything fine. Later I decide to revise the shack model by going to the modeling software loading up the original model and add a porch, Save the revised model, now with the porch addition, return to the MAX map and the original shack model is displayed as expected with a porch. Return to the modeling software and add another porch, save the model as an "x" file, Return to the map and the map shows the model with 2 porches. Continue the process adding porches. I will, after adding several new elements to the shack model, reach a point where the model in the MAX map will not show the additional changes. The thumbnail in the entity listing will not show the proper image as being revised, it is stuck. The only way I can get the Thumbnail to change to the proper updated image is to return to the modeling software and change the model name and save the new "X" file as (example: shack rename as shack1). I must rename the original fpe file and revise the required instructions then when I return to the MAX map the new renamed entity must be added to the map. I can then continue with revisions for a limited number of times then I will be forced to rename the "X" file again. Note: because the original shack.fpe has been changed to shack1.fpe the original "shack" model will be retained on the map only with out all of the additions but the new model "shack1" will show the new additions that the original will not show.
I don't know if I can make this process explanation any more complicated but I can certainly try
Windows 10 creator,64 bit| Intel i7-7700 @3.60GHZ Quad|CPU PASSMARK 10,794|Memory 16GB |NVIDIA GEFORCE GTX 1060|GPU PASSMARK 9,569