@romit
I can't repeat it either. Maybe you could attach a project with such a problem?
How to change ip after every load of page in browser
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@mrezair You need to use proxy action every time before page load.
Here is tutorial and video, which explains it in more details
http://wiki.bablosoft.com/doku.php?id=multithreading
http://wiki.bablosoft.com/doku.php?id=how_to_set_proxy
https://www.youtube.com/watch?v=FCfcgDX8ezk