this happens everytime. During or after login, with or without admin rights, with kix 3.42, 3.63, 2001 rc3. On W2k Sp1, Sp2; NT4 Sp5, Sp6a.
I asked Jochen to try at his machine, he encountered the same problems.
It transfers the value to the var correctly but when I am using it in the script it seems that kix can not resolve the %var% part. Have a look at the examples and give yourself a try.

Fabian