Well, the positive part is that I can also now open the pbix file with that latest build (woohoo!!), but the negative side is that I now get an error when trying to publish the report. I never had any issues publishing this report before, but now every time I try it throws the error "AN ERROR OCCURRED WHILE ATTEMPTING TO PUBLISH '<report_name>.PBIX': THE REMOTE SERVER RETURNED AN ERROR: (404) NOT FOUND."
I've given up trying to figure this out and have opened a support case instead. Moral of the story is that I need to be super cautious about upgrading my client in future, and more paranoid about keeping multiple backup copies of reports between desktop versions. SMH.
Im having this issue since yesterday, it's killing me!! I need to present a report to C-Lev execs today and I cant publish. This is horrible!!!