A family of Microsoft word processing software products for creating web, email, and print documents.
I have the same problem, but have been able to replicate and at least have a workaround fix, albeit not a complete fix.
In word, the insertion point cursor begins black, but if I move the cursor out of the window and then back to the Word window, the insertion point is now white.
The "fix" is to click outside of the Word window, and then click on the Word page again.
What appears to be happening is that moving the cursor out of the Word window without clicking is changing the cursor from an insertion point to a pointer. Because the focus window has not changed though, bringing the cursor back to the Word page triggers the change of cursor type, but no information about cursor colour, and so we get a white cursor. By changing the focus window and then coming back into Word and doing the change from pointer to insertion point in Word, we get that colour trigger, and our black cursor back