Hey everybody!
I read your conversation since I had an issue with setting up my shop as well!
I have Joomla! 2.5.11 and Virtuemart 2.0.20b. First I installed Joomla multilanguage (EN, IT, SV) then VM.. I tried to save my shop too but no success!
In the end I solved the problem by manually setting the value of the currency in the db. The field needs an integer and for me Euros and Swedish Crowns were needed (# for € = 47, #for SweKr = 124)
I still have to test my shop on a production site but I believe everything will be fine!
Hope this help!!
Best