Based on agreement between Intel® and Apple, all support and drivers will be provided by the Computer Manufacturer only.
The drivers we provided are generic drivers and Apple has their properly graphics drivers, so that is the reason why we suggest you to contact that company.
Additional support can be addressed to this page http://www.apple.com/support/mac/
If you want to try our generic drivers; however if the issue persists, it will be necessary to contact Apple for further support.
The latest driver available for the Iris 5100 is version 3960 Intel® Download Center
The previous version will be 3907 Intel® Download Center