But since i have checked "Dont SEF" for Virtuemart in JoomSEF it shouldn´t in my opinion affect the URL´s generated by this Virtuemart payment method.

I didn´t manage to solve this. I e-mailed Artio support and got the following answer;

- "the URLs you have sent, seems to be wrong. The URL cannot include 2x
option variable - that will certainly cause troubles and unexpected
behaviour."

Hi,

I have Artio JoomSEF 3.7.4 (Order nr.:13367), Joomla 1.5.15 and Virtuemart 1.1.4.

At checkout in Virtuemart, the buyer is redirected to the frontpage of the site even though i have disabled SEF-url´s for Virtuemart.

The URL at checkout with JoomSEF enabled is:
index.php?Itemid=1&option=com_virtuemart&page=checkout.kreditor&option=com_content&view=frontpage&Itemid=1&order_number=-142_3215721c8f289a54dfe85f17e7f

And the URL at checkout with JoomSEF disabled is:
index.php?Itemid=1&option=com_virtuemart&page=checkout.kreditor&view=frontpage&order_number=-142_3215721c8f289a54dfe85f17e7f

In the one URL with JoomSEF enabled, there is a addition of "&option=com_content". When i remove this manually the checkout page is appearing.

Can i make a "Custom SEF URL" to somehow get rid of the "option=com_content"?

Or is it possible to edit the sourcecode somehow?

I would really appreciate any suggestions.