I have s/s with tabs for each month (plus a few more). Over a repeated sequence of open/modify/save/close cycles, the sheet referrences disppear and the cell then contains Err:522 with the formula just showing the cell reference: "=jan.a1" then contains only "=a1".
Hi @Jim, thanks for reporting.
Pls if you are not agree reopen it.
*** This bug has been marked as a duplicate of bug 82936 ***