The latest MT4 update was released a few days ago, and due to the nature of the update it has caused issues with connecting to some brokers. This update to FX Synergy 1.5 Beta solves the issue.
It’s quite rare for an MT4 update to impact FX Synergy, however in this case it did. We could have released this update sooner, however it took our developers some time to determine that something had in fact changed on the broker side, because not all brokers who updated their servers were affected.
To download the latest build, simply use the download link in the original post announcing the beta. Please note that you will be asked to un-install the previous version, this is normal, your settings will be saved.