I made a calculated column which is the base of my report. It worked till last week. Last week it started to break.
Breaking means that the calculated column works, till i press 'save'. Than it gives a **bleep**ue error that my syntax is incorrect. If I try it a few times it eventually starts working again.
Now I got to the point I am afraid to make any changes, because I am afraid the column will break when saving. In my desktop and Service (development) it works at the moment, but in the TEST surrounding it broke and I am unable to get it back to work.
I tried to reproduce your problem but unfortunately without success. Do you still have similar problems if you operate with a copy of this pbix? Are you sure there are no other recent changes to this file?