IQFeed-parsing-error-on-external-symbols

I consistently get this IQFeed parsing error message on each new session of WL7. It's always associated with fetching an external symbol ...

CODE:
TimeSeries observedIndex = IndicatorFactory.GetHistory(bars, "SPX.XO", bars.Scale, indexSymbolDirectory).Close;

... and once that external symbol is cached, it doesn't occur again (so it's not that annoying). This started around Build 9 or 10 of the IQFeed provider and has been there until now, Build 13.