Shelf resources are gone after 7.2 update

This page explains why resources may have disappeared and how to restore them.

After updating to version 7.2 (or newer) custom resources in the Shelf such as alphas, filters, materials, smart materials or even smart masks may have disappeared. This is because this new version did a reset of the preferences and that files are now located in a different folder. The old resources are only ignored and can be restored by copying the files manually. To do so, take a look at the migration guide.