I had to change the settings to "skype.exe -DEP -SEHOP -EAF -StackPivot" to get skype 6.18 going on all computers.

EMET.admx:

<item key="Software\Policies\Microsoft\EMET\Defaults" valueName="Skype">

<value>

<string>*\Skype\Phone\Skype.exe -DEP -SEHOP -EAF -StackPivot</string>

</value>

</item>

EMET.adml:

<presentation id="Misc_Text">

<text>Included products and mitigations:</text>

<text>- Skype - all mitigations except DEP, SEHOP, EAF, StackPivot</text>