Hi, I'm running the late version of Content5. When choosing the "Content Block" from the list of options, the dialogue window appears as if loading, but it remains blank. "Add Content" is in the left corner, "Close" is in the right corner. For a split second the loading icon appears, then disappears. Can't add any text. Any suggestions? I'm running Windows 64, and this occurs in latest versions of Chrome, Firefox, and IE.

Thanks for any help.