Hello all, I am new to this board.
I have been having the same trouble with case 5 as most people with the gun in the warehouse. I got pretty aggravated with it for a while, but finally got it a few days ago. I zoomed all the way out as far as I could (I could barely see grissom and catherine), and panned around the room(I had the "investigate closer" tag on cause the room is so damn dark.) On the lower left of the tv screen, it hit on something, and it was the gun. Hope this helps.
Also on case 6 there is a glitch with Nicoles green blouse(the one that she says she had dry cleaned). after interrogating her and everett(at this point you should have a warrant to interrogate both), she will tell you that she had sent some stuff to be dry-cleaned, and Everett says the same thing. You get a message to check the suite. go to the suite and sara says that the maid brought the blouse, and that it is covered by the original search warrant. Anyways, the glitch is that there are only 2 items to collect from the blouse; the luminol stain(use luminol on the spot on the upper right of the blouse, then swab it), and use lifting tape in the same area to get a fiber. I got a hint, and the hint said that was the only 2 items on the blouse. However, in the lab, I still get the "there is more to do with this item" message. ignore the message, there is nothing else. it is just the luminol stain and the fiber. compare the fiber to the material from the bullet.