Doug,
The yellow warning sign indicates an alert condition on a ticker symbol, and does not affect updates.
If you are seeing a problem, please specify PSM version, quote service (I'm assuming Yahoo), and symbols in question. Even better, please send a sample file to me at support@personalstockmonitor.com. Note that 52-week high and low values are not available for all tickers anyway, and we can not control when or whether the quote service sends them in any particular instance.