Follow mouse problem

i have a problem with this simple effect -the mouse follow. Actually, on my splash screen, i have tow tiny lines which i intend to follow thw mouse, one in the x-direction and the other y-direction. but only one works. and it’s difficult to click on any link. The curcor refuses to just appear. if i disable one, the other works.
Any ideas?
(i used onenterframe, and “lock to Rectangle” in Normal mode)