Some gray strings are invisible in a conversation window in Skype for Business 2016 if the Windows theme is in HC mode Content provided by Microsoft Applies to: Skype for Business 2016 Select Product Version All Products Symptoms Assume that you set the Windows theme as High Contrast (HC) mode. When you open a conversation window in Microsoft Skype for Business 2016, you find that some gray strings are invisible. Resolution To fix the issue, install the February 7, 2017, update (KB3141501) for Skype for Business 2016. Last Updated: Feb 7, 2017 Did this solve your problem? Yes No Tell us what we can do to improve the article Submit Thanks! Your feedback will help us improve the support experience.