We've just made available YetiShare v4.1.1 via your account on yetishare.com. If you login (and still within support) you'll see the link to download it. This version fixes a number of issues with the initial v4.1 release a few weeks ago.
You can see it running on our demo site:
(login with user: 'admin' & pass: 'password')
As with any release, make sure you backup your site, files and database before making any changes.
To upgrade your existing codebase, upload the /install/ folder and see the 'Upgrade an existing v4.x install' option. We're happy to help if you get stuck.
Thanks for your continued support.