Hello starg0ddess,Thank you for the question.
The theme issue you've described occurs when the theme manager cannot resolve path to the resource.
If you are using C# and the theme file is located in the folder \WindowsApplication1 and named MyTheme1.xml, the path to the theme in the theme manager should be: "WindowsApplication1.MyTheme1.xml". What's important to note here is that in order to reference the theme, its name should be preceded by the list of folders relative to the project file folder, separated by fullstops.
If you're using VB, you don't need to precede the name of the theme by the folder list, as the themes stored in resources can be referenced without preceding them with the folder list.
I hope this is useful. If you need any further assistance, please contact us again.
the Telerik team