I was working on a Data Source with a total of 11 variables in it. After adding the 12th variable, all the variables in the data source disappeared and I am unable to create a new variable in it. At the Devices page, it still shows that there are 12 variables in it.
I've tried creating a widget with reference to a variable in that data source but stuck at the "Loading data..." buffer. I've also tried logging out and logging in again on another browser but it stays the same.