Anyone know this BUG?

When hovering with the mouse cursor above the tree elements are automatically highlighed both in the tree and in the graphic display (planes, features, parts etc..)

suddenlly it's all GONE! no more dynamic highlight - i have made no change to my user preferences and i can clearly indicate this to happen right after i opened an IGES file. can anyone help me with this? is there any solution?

SolidworksAdministration