How to watch large pictures?

How to watch large pictures? In some steps the pictures are small, when I click the small picture, the system asks me to log in. But I cannot watch the large picture after log in.

Normally you would be able to enlarge the pictures by clicking on them; unfortunately Instructables seems to be experiencing a bug which is affecting several graphic features.
Hopefully they will come up with a fix for it soon & we will all be able to enjoy the site to its full potential.
Actually, please direct people to this topic. The bug is a hard one to trace, so we're trying to consolidate to one thread, and figure out how to reproduce it locally.  Any suggestions from anyone experiencing the problem would be great!