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mubarak -
Thanks - it works!
The old fix was to change kernel/session.php to regenerate = false (see post #11 above) but apparently that now creates the bug in 2.0.18.1...!
Set it to true and now it's working fine (even in IE)!
(But my 4 other 2.0.18.1 sites work fine with no change to that file/switch...)
That should keep phppp up at night for a while.
I might try mirroring the trouble site and upgrading to 2.3.0a and see what happens.