This is also the answer I got from Tilia - it's your bank rate - This is a lie. Either they take into account an approximation (their footnote on transaction slip) but they never adjust once the conversion has been done by the bank and as such they make a nice profit on the change - about 5EUR on a 10.000Linden transaction. Or they define their own change rate and try to put the blame on your bank. I don't know if they would charge PayPal in US$ and let PayPal define the change rate ? If so it would make sense to switch to PayPal paiement for Linden purchase.
Is there a way to get the profile information to open in the sidebar instead of in a browser window cluttering the screen? This in the latest LL viewer.