In my PBI report I have a calculated table (written in DAX). There is a complex calculated column added to the table. On two occasions, I have edited the DAX in that calculated column, and after ...
UPDATE: within 20 minutes of posting the above, I suffered the second issue mentioned: All of the code for my calculated table has been overwritten by the code for a calculated column within the table.
The entire table now shows as an error.
I believe this was prompted by moving away from the code-box for the DAX. I was in the data view.
I think that while it was loading and then trying to apply a filter to a column. I have a cameraphone photo of a data view drop-down filter box that shows only a string of a dozen #ERROR.
[edit] Again, later the same day. This time prompted by trying to clear filters from the tables in the data view.