Desktop background stops functioning when switchiing monitors

Thanks, apple forums - you archived my thread before it was solved!
I have an original Core Duo Macbook Pro 17" with 10.6.2, and an external Samsung 1600x1200 LCD.
When at home, I use the built-in 1680x1050 LCD for working. When at work, I keep the lid closed and plug in my 1600x1200 LCD using DVI.
There are three problems that occur when switching monitors:
1. All desktop icons disappear. No context menu appears with right click. No selection rectangle appears when dragging. This occurs 20% of the time.
2. Desktop icons move approx 200 pixels right and/or down from their original locations. The selection rectangle does not appear under the mouse cursor but is also shifted by around 200 pixels right and/or down. I can double click on icons but I have to click 200 pixels up/left from where they appear on the screen. This occurs the other 80% of the time.
3. Mouse cursor is heavily corrupted - it shows up as a random block of pixels approx 100 pixels wide and 20 pixels high. Mouse pointer will come back if I hover over an area of text, for example in Mail. This occurs randomly, around 50% of the time.
To fix 1 and 2, I can do a "killall Finder" from a Terminal.
If I have a web browser open when I switch monitors, the mouse location is incorrectly read and I have to close the window to correct this (i.e. when moving the mouse cursor down a drop-down box, the highlighted item is about 200 pixels down from the cursor location).
It seems to me that there is some code in OS X that is broken when switching between primary monitors that are different resolutions. I'm looking to buy a new Mac but I won't be interested until this problem is fixed since this affects my daily work.
Thanks.

The problem occurs with any monitor a different native resolution to the MacBook Pro's built-in 1680x1050 panel.
The problem does not show up if the externel panel is connected before cold-booting the computer because the nature of the problem is that the problem occurs when changing monitors. I will connect the externel panel before coming out of sleep, or disconnect after going to sleep.

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C:\Users\myusername\AppData\Local\Microsoft\Windows\WER\ReportArchive\AppCrash_mstsc.exe_fe9be6b453d387663f457b9f305ac5e3ae6f5fc2_00000000_2fb47393\Report.wer
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Response.LegacyBucketId=-439202015
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Sig[5].Name=Problem Signature 06
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UI[4]=Windows can check online for a solution to the problem.
UI[5]=Check online for a solution and close the program
UI[6]=Check online for a solution later and close the program
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