until alex can fix it (I’m sure he’s busy), you can simply jump into the plugin folder under:
admin:album.php
and replace the code at line 374 with the following code:
if($picture->pid == $album->previewpic){
echo '<option value="' . $picture->pid . '" selected="selected">'. $picture->pid . ' - ' . $picture->filename.'</option>'."\n";
}else{
echo '<option value="' . $picture->pid . '" >'. $picture->pid . ' - ' . $picture->filename.'</option>'."\n";
}