When I create a new document and go tu "import animation frames" it's grayed out at first. As soon as I create a new Frame it's available. I think the creation of the Frame should happen automatically when using "import animation frames" and it should never be grayed out.
I can confirm on ubuntu 16.04
Git commit a545f536c7f83c904efc8475ffa944572e190111 by Boudewijn Rempt. Committed on 23/01/2017 at 15:03. Pushed by rempt into branch 'master'. M +0 -1 libs/ui/KisMainWindow.cpp https://commits.kde.org/krita/a545f536c7f83c904efc8475ffa944572e190111
Git commit 88e2eae87889b4bd3e01bed4bd0f157cbaf407ab by Boudewijn Rempt. Committed on 23/01/2017 at 15:03. Pushed by rempt into branch 'krita/3.1'. M +0 -1 libs/ui/KisMainWindow.cpp https://commits.kde.org/krita/88e2eae87889b4bd3e01bed4bd0f157cbaf407ab