While we have seen cases where the price for a company was not updated for a day, the most common reason we have seen is the definition of a 52-week, or yearly high and low price used by most finance sites on the internet when compared to Toolkit 6.
We have found that most sites work on a calendar year basis, and will show either a rolling 52-week period, or a 'since the start of the year' when looking for yearly high and low prices.

In comparison, the historical high and low prices in Toolkit are based strictly on a comapny's fiscal year.