Recently an issue was discovered where players cannot get past the "Logging In" screen of the new Trainer Challenge beta client. Just to clarify, that would be this screen:
<img src="http://i.imgur.com/dylg5.jpg" alt="" />
The team has found that this issue is related to certain screen name characters and most cases can be resolved by minor changes. However we are currently working on a permanent fix.
If you are experiencing this issue and would like to access the Trainer Challenge client immediately, please submit a ticket to the support team via the link in my signature and they will assist you further to get you going in the Trainer Challenge!
We will be providing updates within this thread once we have more information regarding a permanent resolution, so keep checking back!
As always, stay cool!
Need to report a bug or an issue? Submit a ticket to support.pokemon.com!
"I'm like a hunter of peace. One who chases the elusive mayfly of love... or something like that."
- Vash the Stampede