The Community in more languages
Now the forum welcomes more languages.
You'll see a green translate button in comments and discussions to turn them into English
Hi Applelight, the strange problem you have could be because you moved the special building before you digged out the purple box. Purple treasure box generally come with special building and i did not see any around the box, but this is just a guess.
The other option you can try is to select other than Dig let the map selection change, play few times see if the purple box lights up.