nono. misunderstanding.
you can set superuser 3 ways.
Prompt
Deny
Allow
Prompt is what we want. (ie they ask for it the first time) when an app wants root superuser will pop up a little window saying do you wish to grant this program root access? you hit yes or no. yes means its good to go from now on as well.
deny means it simply rejects
ALLOW means it won't prompt you at all it will simply let ANY program have root access (which is the way you have to use it with v17)
when I installed V2 I ended up with both SuperSU and Superuser so I froze SuperSu rebooted and let superuser go at it (since v2 installed that) and NOW it works.
now it "prompts" me when a new program wants root access.
ie the right way to use it
default allow is dangerous because malicious programs in theory would simply run.
with v17 there was no ask the first time. it just did not work. but if you set it to default allow it worked (but thats dangerous)
v2 does not have this problem.