Hi all.

Can Jms Multi Site operate slave sites that live on seperate hosting accounts? Or does the master and slave sites all have to be on one hosting account?

If you want to use JMS on different hosting account present on the same server, then you need to ensure that different hosting account can have access to the files and folders of the other account.
In general, different hosting account does not allow to access the files and folders of another account. So you should change such permission to give the permission and also see the problem with the ownership of the files and folder.
You need to be a server administration expert to change such linux permission and manage correctly the ownership and permission.

The easiest and standard method is to have all the websites present on the same hosting account to avoid the problem of permission. This is what we recommend event if it is not excluded to do in another way.