Hello David ,
I have a few questions:
1) About the problem with field header - Do you mean that changing the HeaderText="<%$ Resources:Labels, Type %>" - doesn't not result in showing a column header with the value of the 'Type' label inside Labels resource class?
2) Did you edit the template directly from the widget designer (Edit Thumbnail list template
button).-> you need to do this so the specific instance of the widget is associated with the edited template and not with the default one.
3)Did you actually add a label - 'Type' in the Labels resource class (~/Sitefinity/Administration/Labels)
4) Try restarting the application. It seems that some caching is taking place and the changed template is not showing, also the added resource label might not - this is a big we will get fixed soon.
All the best,
the Telerik team
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