Sorry, I don't think that you resolved my problem.
Perhaps I didn't explain it well:
I have the problem with my old way (_tally) and the problem resolved when I started to use with the new way (reccount()).
My question was why my old way stopped to work and _tally started to return (sometimes) the value 0 even that there is a lines in the cursor.

PS
As you can see I used with 'noilter'.