Hello Wouter Verheij,
Thank you for your feedback, from your description, there are some pre-condition missing when migrate with Style library manager due to material style resources change. Please follow steps below to resolve it.
Pre-conditions:
1. Launch Inventor and create a file such as a part
2. Open Material browser, migrate library to a new create library, say “Test.adsklib”
3.
Project setting, add library Test to Appearance and Material node and set as active.
4. Close Inventor
Migration:
5. Start Style library manager
6. Continue with the normal steps to migrate the styles
Result, Migrate successfully
Hope it helps.
Any more questions, please let me know.
Xun