Xthreads ERROR

[Gypaete]

Hello

I have a bug with the plugin Xthreads

I go to my ACP-> Forums-> Edit a forum
And in this step:
Prefix Template
i put this: example_

and i go to the templates masters ,i put example_forumbit_depth2_forum and i put this content :
content
and i go to the index of my forum and the template of the forum previous (example_)


now does not work,before yes,now  I do not know why. HELP PLEASE