Think your changes out before springing them on users
New and improved??
I have been using computers for over 60 years, starting with a cards in/cards out IBM 650 to Univac mainframes to the earliest personal computer to “The Computer for the Rest of Us” (The Macintosh). Look up the ad “Why 1984 will not be 1984”.
Unfortunately, 1984 arrived with Apple’s OS X. Everything has changed from gradual changes to complete changes that make previous data unusable, requiring days and weeks to update. Many of these changes are difficult to decipher or many hours to undo (like an update that moved giga-bytes of data to the cloud.
Now Yahoo! had done that with it Finance pages.
For years, I have kept a spreadsheet of weekly data for several stocks or mutual funds. I had Yahoo! set up to give me closing prices every Friday.
I missed a week and when I tried to have Yahoo! give me my data, nothing happened. i went to bed frustrated not knowing what had changed.
On Saturday, I figured out that I had to completely rebuild my list. When I requested the list, I found out that it had the high and low prices but not the closing prices which is what I really wanted.
I went to Yahoo! help section and found out that I was not alone. Many commenters were very upset about the changes.
Well, back to figuring out how to get the data I want.

Thank you for your report, so sorry for any inconvenience.
Our engineers are interested to learn more about your experience, can you please provide them with additional information and specific example of tickers that have no close price?
Email us at finance.support@verizonmedia.com
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Melvyn Magree commented
Thanks for your response, but after 60 years of debugging my own and others software, I don't wish to do so anymore, unpaid or paid.