Multi Currency switcher working on one product but not on another

I successfully installed and configured multi currency plugin and it is working fine on a subscription product and an event product. Today I came to add a physical product and added the three currency prices but the manual switcher does not appear on the product page (just the base price). I have tried changing the product to a virtual product etc but nothing seems to work. I updated Woo commerce plugin yesterday to 3.8.0 and I can’t help wondering if this has affected the multi currency plug in…? Any help appreciated.