Hey guys! I made it work!! =)
First I downloaded the “Cron Manager” plugin, then I saw that the Cron Job that expires the members wasn’t there.
I stopped the cache plugin (the author said that this could be the reason of the problem) and reinstalled the Paid Membership Pro Plugin. After that, the Cron Job that expires the members appeared on the list. =)
Since that, I don’t use cache plugin anymore.
Hope it works for all of you.
Thanks for helping me.
I made the same test after the last atualization of the plugin and it still doesn’t work. =(