If you've been using Electrum with a proxy to hide your IP address, I must tell you that Electrum is leaking furiously.

Also, this issue has been known to the Electrum developers for a while and they are doing nothing about it:
https://github.com/spesmilo/electrum/issues/224
https://github.com/spesmilo/electrum/issues/207
https://github.com/spesmilo/electrum/issues/147

I thought that Bitcoin clients take security seriously...