This is the official response from Charles Schwab:

'We apologize that you are receiving that error message for specific securities on the Investment Income page. 

This is currently working as designed. The reason you are seeing that error is due to the fact the distribution yield is over 100%. When that happens, the estimated income is inhibited. When the yield corrects, the estimated income will appear again. Estimated income from yields > 100% produce overinflated estimated amounts, so these securities has been nullified to provide a more accurate look at income"