So, if you are in the text window to reply to a comment here on the forum, the cursor marker suddenly just hops to the location on the page where you mouse pointer happens to be. Correct? Yes
And you are using the mouse pad on the laptop keyboard for moving your mouse. Correct? Yes
IF you move your mouse pointer outside of the text window before you start typing, does that have any effect? Yes, that solves the problem but not practical
(you should be able to see the cursor in the window, and still move you mouse pointer around. Correct? ) Yes
I just finished updating my duaghter's old laptop to win 10.
I can play around with it to see if I can reproduce what you're seeing.
I may pester you with a couple of PMs, if you don't mind to see if we can figure it out. Thanks!