Site looping back to Login after checkout

-- HikaShop version -- : 2.5.0
-- Joomla version -- : 3.4.3
-- PHP version -- : 5.6.11
-- Browser(s) name and version -- : Firefox 39

Hello,
After the 2.5.0 update customers have been calling and telling us they can not complete the checkout process.
After they fill out the required fields and hit next it loops to the same page but the option have been selected.

When I try to buy something from my site it wont progress from the login page.
There are no error messages.
These are the checkout settings I have selected

view.xscreenshot.com/cee77d80a68ff13e3feec29f7c2f1793

Has anyone else had this problem?
Thank you

OK, I cleared cookies and cache. Now it loops me back to the Login. Over and over again

If I disable the Canada Post shipping plugin , it works. Checkout can be finished and the order goes through.
The CP plugin has been working for 10 months now, but not after this recent update.

Can you please check the 2.5.0 update and see what the conflict is?
Thanks very much

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After a lot of testing, we succeed to reproduce your issue which was coming from the Canada Post shipping method.
You'll find through that thread the last Canada post shipping method version which will be add through the last Hikashop version :
www.hikashop.com/forum/checkout/878304-c...-via-hik.html#209321

You nailed it!

Thank you for your efforts