I do have a problem with Yummy at my MacBook. Since I installed the latest upgrade, both windows scroll together the same way, as if the scrolls are bound together, which is very irritating. Because I don't use the MacBook very often, I forgot every time, but no I've got a bit more time and I am wondering: what can I do to this bug?
Nothing to do with the update... You have inadvertently enabled the DualBrowse feature. It does this, and other things like navigating into matching directories at the same time.
Choose the DualBrowse option from the Listing menu to turn it off.
A few FTP clients now have a similar feature, but Yummy takes it to the next level. It is the only one that does the sync scrolling, and synced outline view disclosure triangles, for example.