After yesterdays update, wake on lan not working.

[davef]

OK something happened yesterday and the ID of  one of my PC's changed. I have three PC's at home. Two were fine but one changed. I had to re-register that PC with Teamviewer servers. However, one feature that used to work with that particular PC was wake on lan, It was particularly useful because the PC is in the next room and I use it to wake up the PC before I use Teamviewer to communicate with it. But suddenly it just stopped working. I re-configured the target PC in the Options to accept wake on lan from my main PC, but nothing. My main PC no longer has the option to wake the remote PC. Does anyone know what's going on?