Workspace switcher applet create problem in vertical position

Dear Developer,
to always I have a weird behavior with docky when it is in vertical position.
It means the last applet on the bottom it's impossible to activate with the mouse rollover just only a little portion really close to previous applet.

I have thought until now it was a general problem of docky but now I understand it's a problem due to workspace switcher(WS).

After the last update I saw a changing in the WS it had a look like this (as in horizontal position):

(2 rows X 2 cols)
 ___
| | |
―――――
| | |
―――――

And surprising all the applet at bottom of the dock were completely clickables.

But after few days I noted the aspect of WS is change again in the previous shape like this:

(4 rows X 1 col)

―――
| |
―――
| |
―――
| |
―――
| |
―――

And how I imagined the last applet, whatever, it doesn't clickable.

To confirm my idea I removed the WS and all the applet work correctly so I discovered the cause of this problem on docky is the WS. I had this problem since Debian Wheezy.

Log:

[Info 13:02:15.781] Docky version: 2.2.0 Release
[Info 13:02:15.796] Kernel version: 3.11.1.64
[Info 13:02:15.799] CLR version: 4.0.30319.1
[Debug 13:02:16.385] [UserArgs] BufferTime = 0
[Debug 13:02:16.386] [UserArgs] MaxSize = 2147483647
[Debug 13:02:16.387] [UserArgs] NetbookMode = False
[Debug 13:02:16.387] [UserArgs] NoPollCursor = False
[Debug 13:02:16.430] [SystemService] Using org.freedesktop.UPower for battery information
[Info 13:02:16.476] [ThemeService] Setting theme: Classic
[Debug 13:02:16.506] [DesktopItemService] Loading remap file '/usr/share/docky/remaps.ini'.
[Debug 13:02:16.526] [DesktopItemService] Remapping 'Picasa3.exe' to 'picasa'.
[Debug 13:02:16.526] [DesktopItemService] Remapping 'nbexec' to 'netbeans'.
[Debug 13:02:16.526] [DesktopItemService] Remapping 'deja-dup-preferences' to 'deja-dup'.
[Debug 13:02:16.527] [DesktopItemService] Remapping 'VirtualBox' to 'virtualbox'.
[Warn 13:02:16.528] [DesktopItemService] Could not find remap file '/home/user/.local/share/docky/remaps.ini'!
[Debug 13:02:16.532] [DesktopItemService] Loading desktop item cache '/home/user/.cache/docky/docky.desktop.it_IT.UTF-8.cache'.
[Info 13:02:17.821] [DockServices] Dock services initialized.
[Debug 13:02:17.859] [DBusManager] DBus Registered: org.gnome.Docky
[Debug 13:02:17.867] [DBusManager] DBus Registered: net.launchpad.DockManager
[Debug 13:02:18.210] [PluginManager] Plugin manager initialized.
[Debug 13:02:18.249] [PluginManager] Processing config file for "Battery Monitor".
[Debug 13:02:18.283] [PluginManager] Processing config file for "Bookmarks".
[Debug 13:02:18.285] [PluginManager] Processing config file for "CPU Monitor".
[Debug 13:02:18.287] [PluginManager] Processing config file for "Clippy".
[Debug 13:02:18.290] [PluginManager] Processing config file for "Clock".
[Debug 13:02:18.292] [PluginManager] Processing config file for "Desktop".
[Debug 13:02:18.295] [PluginManager] Processing config file for "Gmail".
[Debug 13:02:18.305] [PluginManager] Processing config file for "Mounter".
[Debug 13:02:18.308] [PluginManager] Processing config file for "NPR".
[Debug 13:02:18.311] [PluginManager] Processing config file for "Network Manager".
[Debug 13:02:18.315] [PluginManager] Processing config file for "Network Monitor".
[Debug 13:02:18.323] [PluginManager] Processing config file for "Recent Documents".
[Debug 13:02:18.327] [PluginManager] Processing config file for "Session Manager".
[Debug 13:02:18.335] [PluginManager] Processing config file for "Timer".
[Debug 13:02:18.340] [PluginManager] Processing config file for "Trash".
[Debug 13:02:18.344] [PluginManager] Processing config file for "Weather".
[Debug 13:02:18.349] [PluginManager] Processing config file for "Workspace Switcher".
[Info 13:02:18.657] [PluginManager] Loaded "CPU Monitor".
[Info 13:02:18.658] [PluginManager] Loaded "Workspace Switcher".
[Info 13:02:18.659] [PluginManager] Loaded "Mounter".
[Info 13:02:18.659] [PluginManager] Loaded "Desktop".
[Info 13:02:18.818] [PluginManager] Loaded "Trash".
[Info 13:02:18.820] [PluginManager] Loaded "Docky.Widgets,1.0".
[Info 13:02:18.820] [PluginManager] Loaded "Weather".
[Debug 13:02:20.076] [AbstractWeatherSource] Weather Underground: reload success
[Debug 13:02:20.087] [AbstractWeatherSource] Weather Underground: reload success
[Info 13:02:20.091] [AbstractWeatherSource] Weather Underground: Reloading weather data
[Debug 13:02:20.113] [AbstractWeatherSource] Weather Underground: Fetching XML file 'http://api.wunderground.com/auto/wui/geo/WXCurrentObXML/index.xml?query=33175'
[Debug 13:02:21.005] [AbstractWeatherSource] Weather Underground: Fetching XML file 'http://api.wunderground.com/auto/wui/geo/ForecastXML/index.xml?query=33175'
[Debug 13:02:21.353] [AbstractWeatherSource] Weather Underground: reload success

*Docky version*:
Version: 2.2.0-1

Distro in use:
Debian GNU/Linux testing (jessie)

X Version:
xserver-xorg
Version: 1:7.7+4

Video Card
VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Wrestler [Radeon HD 6320]
server glx vendor string: SGI
client glx vendor string: Mesa Project and SGI
OpenGL vendor string: X.Org
direct rendering: Yes
OpenGL renderer string: Gallium 0.4 on AMD PALM
    GL_MESA_texture_signed_rgba, GL_NV_conditional_render, GL_NV_depth_clamp,
    GL_MESA_window_pos, GL_NV_blend_square, GL_NV_conditional_render,

Desktop Enviroment
XFCE 4.10

Mono Version:
Version: 2.10.8.1-8

Thanks

D.