I have came across some strange ‘hidden blocks’ that are red and when you actually look at the block it sais undefined? Look here and see inside: http://scratch.mit.edu/projects/11697455/

Undefined blocks were in a previous scratch version, but are now not supported. c: Either that or some code was modified to create them.

For example, the stretch block.

CrystalStar- wrote:

Undefined blocks were in a previous scratch version, but are now not supported. c: Either that or some code was modified to create them.

For example, the stretch block.

Were they in the download of 1.4 or in 1.4 web

There was no 1.4 web version, so it would have been in the download of 1.4 (or earlier).

Mod blocks become undefined in 2.0. In this project, the undefined block was originally a “Stretch” block (I have the downloaded version before 2.0!)

CrystalStar- wrote:

There was no 1.4 web version, so it would have been in the download of 1.4 (or earlier).

Oh, yeah, there wasn't