I had the same problem with the rockets. For me, I think it was because my laptop (even though I have upgraded it) cannot handle 60 rockets firing at once. What you're going to want to do is press CTRL+SHIFT+8 a few times until the HUD displays "1+4". This will fire two rockets at once, one from the 1st batch, and one from the 4th. When you have used 60 rockets, change it to "3+2" to use the remaining Zunis.

If you're not seeing effects, select "Run as Administrator" from the context (right-click) menu.