As mentioned in these threads: - http://community.powerbi.com/t5/Integrations-with-Files-and/Date-issues-with-Sharepoint-file-sources/m-p/372661#M16100 - https://community.powerbi.com/t5/Desktop/Sh...
fenixen
Advocate II
Advocate IIAnonymous try using sharepoint.contents instead of files/folder as described earlier in this thread. Its a bit more work navigating to the correct folder but I've used it in several workbooks the last 6 months.