It's a bug in the command, and the help files for it too. I've made a right mess of the parameters all around on that command.
I've attached a replacement DLL to this post to fix the problem (and a few others I've noticed at the same time).
The parameter order for SET CAMERA VIEW is Left, Top, Right, Bottom.
sync on
sync rate 60
sync sleep 1
backdrop off
box 0, 0, 256, 256, rgb(255,0,0), rgb(0,255,0), rgb(0,0,255), rgb(255,255,255)
get image 1, 0, 0, 256, 256
cls
draw sprites manual
set sprite view 270, 120, 370, 220
do
` paste image 1, mousex(), mousey(), 1
sprite 1, mousex(), mousey(), 1
draw sprites
box outline 269, 119, 370, 220, rgb(0, 0, 0)
set cursor 0, 0
print "Mouse = "; mousex(); "/"; mousey()
print ""
print "View = "; sprite view left(); "/"; sprite view top(); "..."; sprite view right(); "/"; sprite view bottom()
sync
loop
Sorry for the inconvenience
