A heads up, if you haven't seen it already, that certain platforms may impose a "close only" restriction on the Asian open given the uncertainties over Greece

Zerohedge have run a piece to that effect including this from FXPro

With Greece's uncertain future in the Eurozone continuing to dominate the headlines, we would like to inform you that we are doing everything in our power to reduce the risk of trading EUR pairs.

In order to provide a safeguard against a highly volatile market open, trading on EUR pairs may be subject to increased margin requirements.

This depends on the outcome of today's decisive Eurogroup meeting, and how the situation in Greece unfolds over the rest of the weekend.

Please be advised that, depending on the severity of market conditions come Sunday night/Monday morning, we reserve the right to limit EUR trading to the closing of existing positions only.

We will, of course, inform you of the trading conditions that will apply to EUR pairs before market open

I can only advise that you contact your platforms, if they haven't already been in touch, to ascertain if your trading conditions have changed

After the SNB debacle many brokers are now running scared it would seem