The first attempt to run WSPR under VISTA was negative.
WSPR seems to use current folder for writing, but Vista blocks writing inside "Program files".
That was cured by installing WSPR in the other place. Now it works. I think, that it can be cured in other way, by editing WSPR folder privileges or by turning off the UAC. Not tried yet.
73 de Nick, UT2UZ

One more interesting thing found when exploring duplicated spots.

I can understand that sometimes noise can be interpreted as a message:

090812 1750 1 -33 1.5 7.040173 8IT/6Q9WVG 8 -1 18339 19


That happеned during last WSPR activity period (12 August) on 40m band. Once I've noticed the following sequence:

2009-08-12 22:14 UT2UZ 7.040190 -20 0 KO50cr 2 VK8CH PH57 11836 90
2009-08-12 22:14 UT2UZ 7.040147 -8 0 KO50cr 2 VK8CH PH57 11836 90
2009-08-12 22:14 UT2UZ 7.040104 -20 0 KO50cr 2 VK8CH PH57 11836 90

The first idea, came into brains, was that something wrong is with my equipment.

However, more triple sequences were seen that day: