Hi Snow, I managed to create an example that can easily trigger the problem I'm having:
if you create 2 columns, 1 containing the name of the current sheet in each row and an incremental from 1 to a limit set in D4 (I entered 3000 as the limit) and if you create a 3rd column that contains in its first row the formula below (which calculates the factorial of each number modulo 170 in column 2 and then a simplified calculation of the inverse factorial) then you can reproduce the problem: once you hit enter in D5 which triggers the calculation of the cells, if you click in the sheet without waiting for the calculation to finish then you should get the same message as me. But if you wait for the calculation to finish you don't get this message. The annoying thing is that once I get this message, I have to quit Excel afterwards because it won't be able to calculate any more cells.
=LET(F;LAMBDA(G;N;N*SI(N>1;G(G;N-1);1));
H;LAMBDA(G;N;I;SI((N/I)>1;G(G;N/I;I+1);N));
BYROW(B5:DECALER(B5;D4-1;0);
LAMBDA(R;
H(H;SIERREUR(F(F;INDIRECT(R&"!"&ADRESSE(DECALER(R;0;1)+4;3)));
F(F;MOD(INDIRECT(R&"!"&ADRESSE(DECALER(R;0;1)+4;3));170)));1)
)
)
)
