The only open incident I can find for the Data Viewer not displaying data is in the situation where data is being imported from an Excel node and a field in the header record contains quote characters, e.g.
The Excel File node runs successfully and there are data records at its output but the data viewer is blank when opened (it does not produce the 'please check back later' message) and it is possible to write the data to another Excel file.
If this issue is repeatable can you see if you can write the data using the Output BRD File node. If that is successful, can send us the file on a support ticket - or, if that is not possible, can you open the file in Notepad/Notepad++ and edit so it just contains the metadata line from the brd, Save that as a text file and send it to us on a ticket, e.g. equivalent to line 1 in the screenshot below.