So the chalk has stopped working and I'm not able to draw the symbol on the ash infused stone to make the transmutation tablet. Any idea why? It started when I pressed V to toggle the size...the symbol disappeared and now I can't get it to appear at all.

https://dl.dropboxusercontent.com/u/9882100/Minecraft/2015-05-09_12.15.21.png

shift+v is not decreasing the size for me in the latest version. additionally I tried rebinding the keys to remove any possible conflicts there. but this also did not change the result.

any tips?

This is still an issue...some how the chalk size gets stuck. I've open a new issue.

Hit Shift+V to make the size decrease

Thank you. I'm assuming that this will all be detailed in a book of instruction some day. Great work on this BTW.