Hi, just tried to upgrade to 4.12 and I've noticed that our custom resource manager isn't able to load our external locales as it did in the past. After digging a bit, I found out the cause, it seems that the ResourceBundleProxy isn't never loaded when it's stored as a property in the dictionary.
As you can see here[1] the external resource (ResourceBundleProxy is added to localeMap[locale] as a property of the dictionary but when the resourceManagerImpl tries to find the bundle [2] in getResourceBundleInternal, it never uses loadResourceBundleProxy() because the bundleObject is a dictionary and not a ResourceBundleProxy. My solution would be to add a check and instead of if (bundleObject[obj] == localeBundleNameString) { bundle = obj as IResourceBundle; break; } it would be like this if (bundleObject[obj] == localeBundleNameString) { bundle = obj as IResourceBundle; if(bundle is ResourceBundleProxy) bundle = loadResourceBundleProxy(ResourceBundleProxy(bundle)) break; } [1] https://www.dropbox.com/s/jfftyzpfqryhfy2/Captura%20de%20tela%202014-03-28%2012.26.16.png [2] https://www.dropbox.com/s/vp5bhc1ivaa0pkj/Captura%20de%20tela%202014-03-28%2012.31.51.png -- João Fernandes