Any ideas why the "Change Data Source" dialogs are no longer working? I can get it to show "Change Source" for a file, but when I attempt to "Change Source" for a directory, the "Change Source" option remains greyed out. This just started happening after I started using the January release (2.54.4970.761 64-bit (January 2018)):
Solved it! I had previously converted my Folder.Files command to Folder.Contents in order to preclude importing sub-directories. Guess I'll have to figure out another way to not import files from sub-directories than using Folder.Contents. Changing it back to Folder.Files allowed the "Change Source" button to highlight... and, all is well again in PowerBI-Land! 
Solved it! I had previously converted my Folder.Files command to Folder.Contents in order to preclude importing sub-directories. Guess I'll have to figure out another way to not import files from sub-directories than using Folder.Contents. Changing it back to Folder.Files allowed the "Change Source" button to highlight... and, all is well again in PowerBI-Land!
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