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I think I have a simple solution for you. I’ll follow up in about 6 hours with instructions. 🙂

Ok, please try this and let me know if it fixes the issue:

1. Go to Plugins > Editor and select the Challonge plugin.
2. Edit class-challonge-plugin.php
3. About half way down (line 383) you should find the following lines:

   public function widgetReply()
   {
   $this->bIgnoreCached = true; // AJAX requests never should use cached API data

4. Add this line:
   $this->getOptions();
   Just before this line:
   $this->bIgnoreCached = true; // AJAX requests never should use cached API data
5. Save your changes and see if the issue is fixed.

If this fixes your issue, I will include it in the next update.

Thanks!