The countdown area does nothing when it is clicked. The plugin can only be controlled by clicking on an indistinguishable one or two pixels wide bar to the left or right of the countdown area. This is very counter-intuitive.
Which version of XFCE and the plugin are you using? Did you try the recently released 0.6.4? I tested it on Xfce 4.6 and 4.8, it was working in both systems.
For some reason that I don't quite understand, I can't make the mouse click code works simultaneously on 4.6 and 4.8. I realised this at version 0.6.3 and fixed it in 0.6.4.
In versions 0.6.2 and before, the widget structure was like
plugin -> eventbox > hbox that holds the progressbar etc
and the mouseclick event was connected to the eventbox. But this way the mouse clicks on the progressbar were not detected. In 0.6.3 I removed the eventbox and connected the click signals directly to the plugin widget itself. This code worked as expected in 4.8 panels but caused the behaviour you mention in 4.6.
Since I couldn't find a code that works for both, in 0.6.4 used separate codes for 4.6 and 4.8 panels.
(In reply to comment #1)
Hi. Thanks for your elaborate comment! (And sorry for my not-so-elaborate post.)
The versions I had were Xfce 4.8 and xfce4-timer-plugin 0.6.2. I installed version 0.6.4 of the plugin and it works as it should. So, the problem was the one you described.
That's good, and the bug report is closed...