Strange cursor behavior

I have a new 17" Powerbook, and I have started having troubles with 
TeXShop.  I wonder whether anyone else has seen this.

When I'm typing near the insertion point, it's as if everything is 
going into the bit bucket--nothing appears on-screen.  Then when I move 
the cursor just a tiny bit, all that I typed suddenly appears onscreen. 
 As you can imagine, one is FREQUENTLY typing near the insertion point! 
 So this is incredibly frustrating.

I don't think I see it in other apps, like Mail or BBEdit.

Any idea what the problem could be?  Is it a TeXShop issue, or a 
Powerbook issue, or what?

It's not just when using the trackpad, incidentally.  It also works 
when I'm working using a Bluetooth keyboard and Bluetooth mouse.

Bluetooth is wonderful, BTW.  I have a new Sony Ericsson T610 
cellphone, and syncing my Powerbook's address book and calendar worked 
first time, right out of the box.

--Ron Bruck

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