When zoomed in mouiselook I see this what looks like a snowflake bouncing in front of me

[Rolig Loon]

If you truly are in mouselook, it sounds like what you're seeing is your click target ( crosshairs, camera focus ..... ).  If you really don't want to see it, you can remove it with the debug setting ShowCrosshairs, which you will find in your Advanced (CTRL + Alt + D) menu.  That setting defaults to TRUE, so changing it to FALSE will make the crosshairs disappear.  (Remember what you did, though.  There will probably be a time when you want those crosshairs and will wonder where they went. )

[Rolig Loon]

If you truly are in mouselook, it sounds like what you're seeing is your click target ( crosshairs, camera focus ..... ).  If you really don't want to see it, you can remove it with the debug setting ShowCrosshairs, which you will find in your Advanced (CTRL + Alt + D) menu.  That setting defaults to TRUE, so changing it to FALSE will make the crosshairs disappear.  (Remember what you did, though.  There will probably be a time when you want those crosshairs and will wonder where they went. )

[AssaholicDirector]

If it is your crosshairs, then you can do as the before user suggested by using the advanced menu or you can go under preferences.

Look at the top of the viewer and find Avatar > Prefences > Move & View, > Mouselook > uncheck Show Crosshairs.