Weird jpg behaviour, possible bug?

Noticed weird behaviour when loading jpg’s dynamically.

Loading in first frame adds smoothing to the image while loading in any frame after a playhead in a timeline has moved results in no smoothing.

I put examples up here;
http://www.deligon.com/duztdruid/scaleQuality.html
http://www.deligon.com/duztdruid/scaleQualityHasPlayed.html

FLA’s can be downloaded here;
http://www.deligon.com/duztdruid/scaleQuality.fla

http://www.deligon.com/duztdruid/scaleQualityHasPlayed.fla

My problem is actually that I need the smoothing all the time.

Any ideas / suggestions?