Subject line has it - some issues with the cloud learning instance(s). Attempting to create a new Data Table is causing an uncaught js error and, therefore, fails to launch the required modal. Unfortunately, $1.5k of training credits does not make me a 'customer', so I have no other avenue to report system issues.
Uncaught TypeError: G.showModalDialog is not a function
Attached screenshot may shed more light.
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Here is a link to a PDN article with additional information regarding the error. When Google released Chrome version 37, they removed support for the Window.showModalDialog(). The Designer Studio rule forms have been modified in 7.1.7 to address the issue. For prior versions, it is recommended to use Internet Explorer as you have done.