Hi,
i've been having this issue for the past 2 weeks, finally got it resolved today, why this has to be done all of a sudden, i don't know,
maybe one of the core team can comment:
i just following the posting, and renamed app_gobalresources to dnn_globalresources, made the change to the localization.vb file -
recompiled the dotnetnuke.dll, and published the site, and all my text has come back, and the site seems to be working. (PS: copy the DNN_GlobalResources directory manually to your deployed website folder)
To workaround the problem it is required to rename DotNetNuke App_GlobalResources folder (e.g. to Dnn_GlobalResources) and change the constant ApplicationResourceDirectory in DNNLibrary\Components\Localization\Localization.vb to the same name, e.g.
Public Const ApplicationResourceDirectory As String = "~/Dnn_GlobalResources"
hth