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The specified key is not a valid size for this algorithm.
Reported a frown on this issue. Per the support email, I cleared the cache but am having the same problem. I deleted all temp files per another user having the same problem but that didn't work. I ...
The issue was resolved by deleting the cache.key file here: C:\Users\<username>\AppData\Local\Microsoft\Power BI Desktop\Cache
Just had this problem Anonymous and your tip worked a treat, thanks.