In Shareaza 2.4.0.0 the preview icon size (in search results) was a decent size (I'm guessing 64x64). In 2.4.0.4 (all builds I have tried) this icon is much smaller (perhaps 32x32). Also, if Auto Preview is disabled, the text below the icon which indicates that a preview is available to download is just barely visible at the bottom of the image control.
Windows XP sp3, IE7 (for what it' worth), installed Shareaza 2.4.0.4 on top of 2.4.0.0 to fix a Discovery issue I was having (kept resetting the discovery cache and forgetting what had been discovered).