I think some examples in GLMExamplesBrowser In Pharo5.0 are broken.

see fogbugz issue

"16111 Collections being passed as a whole into blocks, instead of each individual object"

The confusion about "display-block" and "format-block" is sorted out, so we could close
the issue. But it seems the examples

"Updateable browser"
"Validating presentation"

are broken (and maybe the Magritte example, but I don't know where it is).