In this example, a large assembly created in Solid Edge will not show a preview in the Assembly Preview environment.
The preview does not shows any components, even after clicking the "Fit" command.
Try the following workaround:
1. Open the assembly
2. Settings -> Options -> General and turn off the "Store geometry in Assembly for preview".
3. Save the assembly
4. Turn on "Store geometry in Assembly for preview".
5. Save the assembly again.
This should clear the problem.