SharePoint ribbon icons disappeared(网站顶部Top bar 齿轮图标，以及编辑模式下Ribbon中Icon消失)

Questions:

has anyone ever seen this before? all my icons in my ribbon have disappeared.

I'm using my own custom master page based on the minimal, all my ribbon code looks correct..

Answers:

I created a custom master page for SharePoint 2013 and had the same issue. I was also missing the Site Settings, Share, Follow and Focus On Content icons. Like you, the resolution was in the CSS. I have a pretty extensive CSS Reset file and when I removed the CSS Link everything returned to normal. In digging a little deeper here is the exact CSS style I needed to remove.

img { height: auto; max-width: 100%; }

I had this exact problem and it was caused by the css that i had modified. Jeff pointed me in the right direction in that img {max-width:100%;} was the issue.

To correct this i created the following css at the end to overide the img resizing for the ribbon.

.ms-cui-topBar2 img {max-width:none;}

Ran into the same issue after applying the responsive design and got this working in SharePoint 2013 :

.ms-cui-tabContainer img,#suiteBarButtons img {max-width:none !important;} 

PS:

1. refer to :http://sharepoint.stackexchange.com/questions/49369/sharepoint-ribbon-icons-disappeared
2. 修改（删除）Top Bar 中 SkyDrive,Sites,NewsFeed 等链接内容：http://www.learningsharepoint.com/2013/02/10/addremove-links-in-top-suitebar-skydrivesitesnewsfeed-in-sharepoint-2013/