After few days of testing both launchers failed to start.
The exception is java.io.FileNotFoundException: https://eu-demo.dukascopy.com/client/de ... 2.21.4.jar
An update occurred yesterday after I launched jForex, and it stopped working. Besides I was able to run jClient (in jForex mode). Until today.

System settings were not changed a bit. Neither firewall's.
System is Mac OS 10.7.5
JRE is
java version "1.6.0_37"
Java(TM) SE Runtime Environment (build 1.6.0_37-b06-434-11M3909)
Java HotSpot(TM) 64-Bit Server VM (build 20.12-b01-434, mixed mode)

Let me know please if you need more details on this.
This prevents me to open an account in Dukascopy. I interested in Java application because I need all things from it, and I'd like to continue working on my mac.

THANK YOU, oh, Support of Dukascopy, and especially to you, robot "Alexey Yegorov", that you kept silence, while I experienced problems with launching jForex.
This aware me of opening an account in the dealing center WITHOUT real support.

Be good, and from time to time wonder how many other forex brokers are on the market -)

Sure, lots of Forex brokers, but NONE of the overall quality of Dukascopy's ECN and the "total package", in my opinion...
HyperScalper