We just released GridServer patch 5.0.3 20110613. It contains a fix for an issue with Internet Explorer 7 & 8 caused by the previous patch as well as a fix to the uninstall process. Please check the release notes for more details.
The hotfix can be downloaded from customer.datasynapse.com. As a reminder, hotfixes are cumulative and we only make one hotfix jar available at any one time containing all previous hotfixes.