Scanned PDF Images show up black in ScreenSaver Mode

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in past i've scanned random images, converting them pdf files , adding them folder of photos used screensaver on mac, latest batch (on new imac, operating mac os x, v. 10.5.4 w/a 2.66 ghz intel core 2 duo processor , 2 gb 800 mhz ddr2 sdram memory), scanned using adobe reader v. 9, show solid black rather scanned image. instance, older pdf files , jpeg photos show up, latest images, when cross-faded between older ones, displayed solid black rather new image. image appears when open each document individually (so know scanned correctly)...just not when accessed screensaver. have thoughts or suggestions?

thank you!

regards,

j. r.



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