We know of an upgrade issue related to the images, image tags and the markup when upgrading from from 4.2 to 4.2 SP1.
Please refer to the following article - y
ou will find a special patch that will fix the issue which we prepared yesterday.
the Telerik team
Do you want to have your say in the Sitefinity development roadmap? Do you want to know when a feature you requested is added or when a bug fixed? Explore the Telerik Public Issue Tracking
system and vote to affect the priority of the items