White Balance Selector Disappears when moved across the image

Hi
I am using LR 4.4 on an iMac.
Does anyone know why the White Balance Selector tool would disappear when moved across an image?
it seems to change to a vertical line with an arror top and bottom.
The areas of the image on which it disappears seem to be consistent, in other words, it disappears on the same portion of the image eveytime.
UPDATE: Since posting the above a few minutes ago I've noticed that my cursor is behaving eractically. For example, on a different image to the one used above, in the library module using the Loupe the cursor changes from a magnifying glass to an arrow pointing to the right.  It does this on the same part of the image every time.
Thank you for your help
Regards
Message was edited by: iwaddo

Weird cursor problems are a FEATURE of the APPLE os.
There are complaints on the APPLE os system website since 2005.
The last time I checked there were 30 pages of discussions about this on the apple site
https://discussions.apple.com/community/mac_os/os_x_mountain_lion.
I don't think APPLE has a clue as to how to fix this. It is seen in many apps, photoshop most commonly, lightroom,textedit,exxcel, and others.
Pray that something happens in soon to be released 10.8.4.
vince

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