I get the email confirming the export, go back to lastpass - press advanced and export. The first time I did this it said decrypting files locally for a very long time and never did anything else. The second and subsequent times I did this (starting from the beginning, getting a new email, etc) nothing happens at all. I don't even get the decrypting files message. It's like the button doesn't even know I clicked on it.
Firefox, Arch, fully up to date.