This has already been mentioned by RAmeeti on Aug. 16, then by JohnB and myself.
Since I moved from 10.2.0.b18 (3745), including now with b20, I noticed a strange behavior with the Find/Select menu.
after launching PanX and opening a DB
all starts well and the Find/Select menu behaves as expected
then after some time (one hour or so), for no special reason that I have noticed, ‘Contains’ disappears from the possible choices in the Find/Select menu, (Contains, Does Not Contain, Begins With, Ends With, …)
restarting PanX restores the correct situation for a while.