There is an easy way to fix most problems your Tumblr blog might be having with Internet Explorer. IE tends to be a problematic browser and sometimes your Tumblr blog won't display correctly in it like it does Chrome or Firefox. Using the code snippets below, you can force IE to emulate a previous version of itself. In other words, you can make IE9 emulate IE8, IE7, etc. This can solve many Tumblr Internet Explorer issues because chances are, the Tumblr template author designed the theme to work in IE8 meanwhile everyone's using a different, more current version of IE.
Force IE to emulate a previous version instructions
Decide what version of IE you want IE browsers displaying your Tumblr blog to emulate.
Select one of the code snippets from the list above and paste it into your Tumblr blog in the meta tag section of the header next to the other meta tags.
In this video, I should you how to access the source code for your Tumblr blog and identify the beginning and ending head tags.