Q: Airdrop doesn't work since upgrading to Yosemite

Hi,

My wife and I have an MBP each, both running Yosemite with all available patches.  If we open airdrop on our macs we both see each other.  If I drag a file over her in airdrop and drop it, nothing happens.  She doesn't get a prompt and nor do I, the file doesn't seem to appear on her computer either.

If she sends me a file however, it works as expected.

Before Yosemite when I did this it would bring up a bubble asking if I wanted to send, I'd click it, she'd click the bubble asking if she wants to receive it and the file would appear.