Could be dead but you could put it in soil and see what happens. Since it already cracked there really isn't any reason to have it in a paper towel anymore.
To keep them from leaning in one direction go in once in awhile and rotate the cup the other direction from the way its leaning to. That way it will automatically adjust itself to lean the other way. This also helps strengthen the stem.
google is a little better for searching thru forums i found. type in site:www.rollitup.org first then whatever you wanna search after
site:www.rollitup.org search words
i wish i knew what to tell you. i'm not a very experienced grower. if i were you i'd look thru these forums cus im sure someone else had a similar problem.
yeah i have one of those 3 way meters too. they are useful. check out these pictures
http://www.google.com/images?hl=en&source=hp&biw=1920&bih=971&q=calcium+def+cannabis&gbv=2&aq=f&aqi=&aql=&oq=
the brown spots look pretty similar to what you were having.
Yeah I went and got some red plastic cups from walmart and drilled holes at the bottom. Thats what I have it in now. I will go look up those mixes thanks.