After upgrading to 9.10.11 with Nuget it seems that the reference to ImageGlue is missing. Comparison before and after upgrade:
It looks like Dynamicweb.Admin 9.10.11 is dependent on Dynamicweb.Imaging.Providers.ImageGlueProviders 1.0.7 and this package doesn't include the ImageGlue.dll file as the previous used version did (1.0.6):