Here I have two problems. I think none related with the HS, but...
Working in J1.5.26, with a modified Sunshine template.
1. I enabled currency switcher to be visible only in some menus, especially in ones related to HS. BIG MISTAKE! After that, only sometimes, if I was lucky, I saw the module in the Modules view, in the backend, to work with it. Nothing to say, in the frontend it was where it should be, but not in the backend. At one time, I saw it and I enabled again for all menus, and after that is all the time visible in the backend. So be it!
2. Currency switcher: if you switch the currency, you must go in some other menus first and maybe, maybe it will switch. Sometimes. I installed a cache cleaner, wich can clean frontend cache automatically. I set it for 1sec. Now it works. I would prefer to not be the case, but... it works.