I can only add 3 filter rules. When trying to add a fourth I am unable to select what to look at (sender, subject, etc. and is, contains, etc.). I have noticed this also with Build ID 2001062815
The problem is already solved in version 2001072208.
Yes, the fix was checked in on the 13th for Bug 40480 - "Search/Filter UI: Problems adding criteria lines past initial display area" *** This bug has been marked as a duplicate of 40480 ***
Marking verified as a duplicate.