I've just purchased XMod 5.1 and the full license of XModIDE from snowcovered and installed them clean onto a new install of DNN 5.0.1.
Whenever I try to navigate anywhere with the IDE I get the following error.
Void DotNetNuke.UI.Skins.Skin.InjectModule(System.Web.UI.Control, DotNetNuke.Entities.Modules.ModuleInfo, DotNetNuke.Entities.Portals.PortalSettings)
Which I believe is related to a change made in DNN 5 to the way skins work.