Hi,
Awesome Miner uses data from Yahoo for these local currencies. There is a known issue with the Yahoo Finance API where sometimes can fail processing the requests for a long period of time.

In most scenarios, this problem goes away after a while, once Yahoo Finance API gives a successful response. The instability of this API is widely known and not specific to Awesome Miner. However, what I'm planning to do is to provide these exchange rates via my own API to make it more stable.