Samet,
Would you mind filling in a ticket with high priority?
We'll try to look at it asap! Thanks
Google Chrome Frame can be installed in Internet Explorer without administrator rights. This drastically improves JavaScript performance and standards compliancy.
There has to be a meta-tag in the <head> section of index.html for this to work:
<meta http-equiv="X-UA-Compatible" content="chrome=1">
You can add it next to the other meta-tags. Recent versions of Mendix include this line by default.
Maybe the customer has addons installed with IE? These could probably cause conflicts.