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Really now thats interesting,i didnt seem to notice that.

The dawn/dusk effect can sometimes be gained/lost by re-installing the game or by installing a patch.
Edit the '..\Divine Divinity\Run\config.lcl' file in notepad (or any other text editor), add the line "splotchproblem 0" to the end, hit enter (the game expects the last line to be blank) and save. When you start Divinity and load a save, the dawn/dusk effect should be restored.