Problems w/ high resolution pics and thumbnails

[barcena]

When a member post a picture on high resol (I had tons of them on vb 3.8 w/ no issues at all) this will happens. See attachment.

Any way to fix that?.

Also, everytime you open a thumbnail regardless if you can see the pic good or not the background goes black, is that normal?.

How can I fix the pic so it won't be restrained to that little box, the purpouse is to see the HR big and it shows constrained on that little thumbnail. Those pictures were posted via small thumbnail I assume, i just want them to open normally when you click on it.
Thanks.