I reported in the beta build 124 thread (http://xion.r2.com.au/community/viewtopic.php?p=8737#p8737) about occasional tag reading errors but since it's still occurring in the 125 release I thought I'd mention it again.
Playing a folder of files using either the explorer context menu or dragging the folder onto the player will sometimes cause the wrong tag data to be displayed. This is more apparent if you repopulate the playlist by repeatably playing the same set of tracks. This happens on both Windows 7 and XP.
Another small thing I've just noticed, not sure if it's a bug exactly. If you double-click on a file to play it from explorer and immediately double-click on it again then it gets added to the playlist twice. Each successive double-click will enqueue that file again but you have to get the timing right .