MinimWatch icon greyed-out

[tchuyev]

Hi, I'm trying to setup MinimServer on a Windows 8.1 PC and on a Synology NAS (DSM 5.1).
On the server side of things, both instances are up and running.
Java has previously been installed as per prerequisites, and seem to work no problem.

Wether it is on a Windows 7 (64-bit) client machine or on a Apple OS X (Mountain Lion), I just can't manage MinimWatch to work!
The only menus available are: Options, Refresh and Exit.
All other features are greyed out from the system tray icon.

>>> All firewall disabled, same subnet, no NAT...
>>> MinimWatch installer version matches locally installed Java (32 or 64-bit)...
>>> MinimServer and MinimWatch can ping each other both ways...
>>> All versions are up-to-date as of today...
>>> Logs do not show anything interesting...

MinimServer 0.8.3 update 6 + Java 1.7.9_79 (32-bit) are installed and running on DSM 5.1.5022 Update 4.
MinimServer 0.8.3 update 6 + Java 1.8.0_51 (64-bit) are installed and running on Windows 8.1 (64-bit).

Latest versions of Java are installed on Windows 7 and OS X clients.
MinimWatch is 0.8.3 update 32 on both Operating Systems.
Same behaviour on both clients.
No error message at launch.

What else should I check please? What am I missing?
This is driving me nuts. Thanks.