MCDU RSK1 error

Hello all,
Although I've been using flight sims for more than 10 years now, I'm still a newbie in cockpit building.
But I'm really into it now. To begin with, I bought a second hand Cockpitsonic MCDU and CPFlight FCU.
I'm using P3D v2.4 on Windows 8.1, on top of which I installed the latest outstanding Jeehell A320 program.
I hope someone could help me to fix an issue I'm facing with MCDU module.
Indeed, everything else is working fine, except the RSK1 MCDU key which I cannot make it work.
Neither in Jeehell MCDU window, nor through Cockpitsonic hardware.
Although, when I log keys entered in External Hardware module, I can see the event API_SW_MCDU_RSK1 ...
Any help would be appreciated.
Thank you,
Regards,
Franck

I've just tested something else, Jeehell without any hardware.
I started the APU, Batt, etc .... as stated in the documentation, the MCDU came alive with all other instruments ...
But still, I cannot use RSK1 key by clicking on it!
So it may be much more a Jeehell software issue than a cockpitsonic error.
Any of you experienced such an error with Jeehell over P3Dv2.4 and win8.1?
Thank you,
Franck

Franck,

I had the same issue once or twice, but after restarting FMGS it worked well again (FSX with Win7 64bit) Is the error reproducable or does it appear randomly?

Regards,
Stephan

Thank you Stephan for answering me.
This error is always reproductable.
I spent 4 days now trying any kind of tips, even restarting FMGS.
I think I'll give up with this.
And I sell my Cockpitsonic MCDU A320.
I'll try build my cockpit with other options.
Regards,
Franck