today I updated an existing web app with Q1_2010. I simply removed the Telerik.Web.UI ref - and added it new.
The web app compiled without any problems - but on the startpage http://iphone.pp-p.net
the menu became vertical.
I messed around a lot - finally (I was afraid my complex layout makes problems) I added a new empty page and added manually a rad menu - also vertical :(
The reason - no CSS was emitted from web resources - finally I found that nothing came from there.
I "splitted" my project and after hours playing around I found the problem.
My project uses RadCompression and that was (is) the problem.
Everything worked after I removed the RadCompression Module from the modules block
| <add name="ScriptModule" type="System.Web.Handlers.ScriptModule, System.Web.Extensions, Version=188.8.131.52, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>
| <add name="RadCompression" type="Telerik.Web.UI.RadCompression"/>
| <add name="RadUploadModule" type="Telerik.Web.UI.RadUploadHttpModule"/>
Did something change about compression with Q1_2010?