I ave been doing some research, and have found that Logitech tools (for mutli-button mouse) do not play well with windows.
So I am going to assume that your version of Logitech mouse is 5 or more buttons and you are utilizing the Logitech software to operate and program that mouse.
I am also finding that there are several other multi-button mouse that are having the same issues, especially in cases where mouse customization software is installed.
I have run into this issue, and I own an VX Revolution.
My solution was to re-assign the search button to shift+f1, and this has corrected my issue altogether.
Let me know more about your mouse and any software you are using to control it, and I will as well.
If this is the problem I think it is, a button will need to be dedicated to Circle Dock alone, and universally, and I can walk you through how to do that
Let me knowUPDATE:
I found your mouse and it is similar to mine.
In the image below: What do you have assigned to the button pointed to???
This is teh button that I have assigned the Shift+f1 to, and made teh necessary changes in the Circle Dock settings......
If you are interested in doing this, or something similar with another button, let me know what version of teh logitech software you are using, and I can work up a quick tutorial for all of us