Hello All,
Today vBulletin released vBulletin 4.1.9. I reviewed the changes and the changes are targeted for Mobile Style updates. Hence, based on the analysis, I can say that you can safely upgrade to 4.1.9. All of our vBulletin 4.1.8 styles will work with vBulletin 4.1.9 as is, without additional changes. Hence, its safe to upgrade to vBulletin 4.1.9 and continue using our styles.
Regards,
Ketan