Trembling Cursor on Windows PCs

Hi,
i tried connecting my iPad 5 (iOS6 and now iOS7) via Doceri to serval Win XP and Win 7 pcs. This works well, but: after connection my cursor at pc-screen starts immediately to tremble (in an unpleasant way). When I disconnect, trembling stopps. I tried to change resolution - but no effect, the cursor still remains to be restless. What can i do?

Best regards, Josef.
(Sorry for my weak English).