I too am having this issue.
Apps have been created, configured on our site, members can visit the site and log into Twitter however i cannot find the app on apps.twitter.com. No second page, no notifications about app quantity limits, nothing.
I’ve been able to avoid the issue by always copying the key and secret right when i create the app however i ran into an issue this time which prevented me from grabbing it. Now i can’t create a new app to get the key and secret because the name is taken.
This issue is almost a year old so i’m skeptical about a resolution but i need the key and secret by the end of the week (client wants to go live on Monday). Is there anything that can be done? Is there some sort of workaround? Help!