There are no issues in this case, just no availability.
Thanks for your feedback. That's very interesting as in the past I have looked at SQ's F availability on a daily basis within 5 days of travel and "ALWAYS" that have released F award seats and I have seen them appear on KVS. Now let alone not getting availability on dates further out, I can't even see F seats open up on flights that are even for the next day!!!!!
Following is an example LAX-SIN for tomorrow Tue, June 16th - there are 10 F seats unassigned which most likely means these are all unsold being a day before the flight. F redemption shows F-

Either they have started to lock showing availability or there maybe a problem on the ANA engine.
[KVS Availability Tool 3.4.1/Platinum - SNT: Awards/StarAlliance/JP-ANA]
Code:
LAX Los Angeles Int'l CA US [KLAX]
SIN Singapore Changi SG [WSSS]
TUE 16 Jun 2009 / 1 Seat
Carrier Flight From Depart To Arrive A/C Availability
--------- ------ ---- --------- ---- --------- ---- ---- -------------
SQ 11 LAX 14:45 SIN 01:15 +2 744 FS- CS- YS-
[KVS Availability Tool 3.4.1/Platinum - Amadeus Seat Map: 16 Jun 2009/SQ 11/LAX-SIN/744/F]
Code:
A B C | D | F
1 -
2 + + +
3 + + + +
4 + + + -
[+] Available [-] Unavailable [W] Wing [E] Exit Row
At this point I cannot see even 1 x F seat available for any month/day for the balance of the year and next year.
cheers.