<hr /><i>anonymous added on 2011-06-13 23:11:40 UTC:</i><br />
Looks like this problem is not a priority in almost year..
So below is a work-around in case someone needs it:
-- in the incorrect url for ticket history check-ins at the end change:

?y=ci

to be:
 
&y=ci

This will show the check-ins properly.