Empty "Add Page Type" window???

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Exiting C5 site running 2+ years, recently upgraded to the latest version of C5. All has been fine. Recently tried to "Add Page" from "sitemap" and "page header" I get an empty pop-up window. Totally empty nothing but whitespace(see screenshot). Tried different browsers, same result.

Please let me know if you had ever encountered this.

Thanks in advance!

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Sagrab
 
Sagrab replied on at Permalink Reply
Sagrab
"EXISTING"site folks, NOT EXITING.
Sagrab replied on at Permalink Best Answer Reply
Sagrab
Replaced root level "Concrete" Folder with a fresh copy. Everything is running smooth... Either files were corrupted or missing is my guess.