On a document showing validation errors in Open XML SDK (see extract below).
When navigating to another sheet then back to 1st sheet, the 1st sheet is not rendered.

In IE9 native only.

document /xl/styles,xml extract :
<?xml version="1.0" encoding="UTF-8"?>

<styleSheet xmlns="http://schemas.openxmlformats.org/spreadsheetml/2006/main">
<numFmts count="1">
<numFmt numFmtId="165" formatCode="$#,##0.00_);($#,##0.00)"/>
</numFmts>
<fonts count="8">
<font>
<name val="MS Sans Serif"/>
<sz val="10.0"/>
<color rgb="FF000000"/>
<u val="none"/>
</font>
<font>
<name val="MS Sans Serif"/>
<sz val="8.0"/>
<color rgb="FF000000"/>
<u val="none"/>
</font>

Workaround

open the file in Excel 2010, do nothing, and save it. That will fix the issue.

Debug info

• Found lots of CSS rules, over 4067, when loading the file like ZSS-952