Upgraded 4s to iOS8 and can't connect to certain wireless networks anymore

I have an iPhone 4s that I updated to iOS 8. Prior to update, I was using iOS 7 (whatever the latest iteration was), and was able to connect to various wireless networks. Following the update, I am no longer able to connect to the wireless network at my place of work. It tries to connect, does so briefly, and give me an authentication request (screenshot attached). Blank username/passwords don't work, neither does the network name/password combo. Choosing cancel will revert the connection back to 3G.
To try and fix the problem, I have "forgotten" the connection, re-started the phone, and neither has worked I have reset my network connections, and it worked immediately after the reset. The phone was inactive for a while, and upon unlocking, it had reverted to 3G. When I tried to re-connect, it gave the same errors already stated.
I no longer have a back-up from before the upgrade, so I can't go back to 7. My wireless connection on my home network is fine. Nothing has changed with the work wireless since it was working with my iOS 7. It uses a WPA-Personal security, and there are several repeaters for the signal throughout the building.
What is going on and how can I fix it?
http://www.pinterest.com/pin/create/extension/

Set it up as new device, make sure all the apps are updated in the iTunes library and try to use iTunes to restore it again from the latest backup:
iOS: How to back up your data and set up your device as a new device

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