there is no word on buttons in IE browser

there is no word on buttons in IE browser

Dear all

There is a problem that I have.
In IE browser some of the buttons do not have the word on it ,the button works but client cannot see the word to understand  what the button is for.it shows the box only
but it works fine in Firefox.

I want to know why this is happened

Any Idea ?

Thanks in advance
Negin











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