The mouse pointer will randomly
I've always had this problem with using optical mice on high-gloss surfaces. My fix is to use a sheet of paper (not glossy photo or magazine paper, of course) or other flat surface for a mouse pad if I must work on a shiny table.
At the bottom of Macally's web page for the dotMouse is the following information:
"* optical sensored DotMouse functions best on surfaces with details for tracking (e.g., wood, plastic, cloth etc.)
It may not function on reflective, repetitive pattern or non-visible detail surfaces (e.g., glass)."
If this is not your issue, try dampening a cotton swab with isopropyl alcohol and using it to gently wipe off the lens on the bottom of the mouse. Maybe there's some lint in there that waves around as you move the mouse and generates spurious movement information.
on Dec 12, 2010