Macbook pro looses login settings with thunderbolt display

I've noticed that on occasion my MacBook Pro looses its desktop settings when connected to a Thunderbolt display. Why Thunderbolt display discards my MacBook Pro window environment settings upon boot-up is unknown to me. I can tell when this happens when my desktop loads different backgrounds from those on my MacBook Pro. Furthermore, the option in the System Preferences for changing my desktop background will cease to function. I even notice system wide speed degradation.
In order to correct this and reload my MacBook Pro settings I must identify a specific file named “com.apple.loginwindow.plist” and delete it. Doing so resolves whatever existing conflict so that Thunderbolt displays the correct background and enables System Preferrences to work properly.
I would appreciate very much if anyone has a resolution for this problem.
Respectfully,
TomBoltz

I think you need to do a search of the of these forums to see if there is an answer. I saw a lot of suggestions, but the #1 solution is buying a brand new cable. I have personal experience with that. My son recently switched from an HP to a MacBook Pro. The HDMI cable worked perfectly with the HP. It didn't with the Mac. He got a new cable for the Mac, everything resolved itself.
I have heard all kinds of speculation on it, but it happens frequently enough that there must be something going on. I'd spend $30 on a new MiniDisplayPort to DVI connector or whatever you use.

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