Sidebar Toggle not working after Perch 2.6 Update

Hello,

Not sure if it's only me, but after upgrading from Perch 2.5.4 to Perch 2.6, the Toggle Sidebar is not working in the admin. At first I thought it might be a Windows issue during development, but after uploading my site to the live server it's still not working.

Not a big problem, but want to be sure it's not only my site.

Thanks, Joshua