Spreadsheet, cell a1-e1 used for entering 'x' (or not).
a2 contains =COUNTIF(A1:E1;"x"), which IMHO should count the X's in a1:e1.
Entering 5x x by hand works OK.
Delete x from a1..e1 (OK)
Select a1..e1, type 'x' in a1, press alt-enter to fill a1:e1 with x's.
a2 stays 0, even after pressing f9.
Fixed in 4.2.4
*** This bug has been marked as a duplicate of bug 77209 ***