Can't preview expirement

When I created expirement with one alternative page and try to preview alternative page It just show me original page...

I get it on Multivariate experiment and on A/B experiment.
I use:
D6
i18n
pathauto
and more...
all modules of last versions.

maybe something wrong cause I use pathauto?

p.s. Guys you should to note that after change Google Web Optimizer options on site - people need to clear all chaches.
Thanks for great module!