When clicking the letter P in the column header, to set all students to Present, the letter for Not present is checked (the last option).
This is the line that probably should make the selection correctly, but it does not.
javascript:select_all_in(null, 'st129', null);
We are using version 2011071600.
This one is also reported by Emma, http://moodle.org/mod/forum/discuss.php?d=181299#p801031
It is always the rightmost (lowest-value) column that gets selected.
You can sort of hack this by changing the value of Present to 0 and Absent to 2 - sort of like a golf score, where lower is better.
It is not an ideal solution, however.
