Thank you for the provided information. It seems that the given permissions are not enough. Please try the following:
- Give contribute access to the image library site.
- Give contribute access to the image library's parent site.
Also, could you please make clear are you using the Telerik's Image Manager (ImageManager), or the MOSS's built in one (MOSSImageManager)? Please try the solution using both the dialogs. Is the behavior the same?
the Telerik team
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