There are several issues involved in what you report here.
First--the actual non-update. Don't know the cause, but the fix seems to be
solid.
Second--the appearances afterward. In my case(s)--I've just restarted
Microsoft Antispyware and the version number has been 5703.
However, there's an appearance bug where often you will need to file, check
for updates--and then look at help about, and the info should be correct.
--
FAQ for Microsoft Antispyware:
http://www.geocities.com/marfer_mvp/FAQ_MSantispy.htm
I have two machines, XP and 2k, neither of which
auto-updates it's signatures. Bill Sanderson's suggestion
fixed it for me:
(It was difficult for me to find in these forums, so I'm
posting a summary it here.)
1. Shut down MSAS.
2. Delete the two signature files:
gcThreatAuditScanData.gcd
gcThreatAuditThreatData.gcd
3. [Disk Cleanup]: removed "Downloaded Program Files"
4. Restart MSAS and then flail about... Probably just
takes patience to wait for it to update itself? (The ugly
details are below if you're interested.)
On computer #1: First I checked for updates, but it didn't
work. "About" listed an old sig version. Next I started a
quick-scan. Finally I re-checked "About" and it listed the
latest version, 5701. (Running the scan seemed to
"magically" get the new sigs?)
Double checked on computer #2: About listed old ver.
Start then abort quick scan, still About listed old ver.
Check for updates, didn't look like it did anything.
Start/abort quick scan again. Sig files started appearing
in the program folder but were too small. About still old
ver. Waited, then About again, finally it listed 5701 and
the files looked about the right sizes.
good luck