Some Lumia 900 users have reported a curious bug that changes all the grey colors purple on lower brightness settings. According to a poll conducted by WPCentral, this problem affects almost 10% of the users. Fortunately, Nokia is aware of the problem and will be doing something about it through a future update.
The release date for the fix is still unknown, but it will probably be included in the next big update. After all, it’s not a huge issue and some people might say that purple is a lot nicer color than grey, anyway!