It seems that the problem with the blocks not showing up was caused by how the extension was installed. For some reason, when some of you download the file, it either auto-extracts or just doesn't download as a .zip. Zip it up and install it through Stencyl and it should work.
I am also awaiting some info from 1MrPaul1 on an issue about sorting numbers. If anybody else is experiencing this, please post what numbers you have in the list and what setting you are using in the block.