Hi Stan,
We have the latest onepage1.2.289 installed (previous was 1.2.284). It seems that there is a problem with EU mode and javascript? When the customer selects a country during checkout tax should be added if his country is in EU. Now tax is added to some non-eu countries also and is removed for some EU countries! You can verify it here: www.quality-tuning.com.
Thanks,
Chris