This has not been extensively tested yet with different permissions systems, and should be regarded as beta-quality for now. It is confirmed to work with PEX and PermissionsBukkit through Vault.
If upgrading from a previous version of SlotGroups, please note that the configuration format has changed slightly. It will generate a config.yml when run the first time and won't touch your old SlotGroups.yml so you can reference it if needed.