How many securities do you have in your data file?How many of them do you actively own right now?How many securities are marked "Show in Watch List" and do you actually use and display the Watch List in your Portfolio views?
Unless you own or track thousands of securities, the Price History file is small fries. You shouldn't have to worry about file size.
Every time you run OSU with your investment accounts included, even with Download Quotes unchecked, Holdings information and most recent closing quote for each stock you own is downloaded.
How about you post an image of the File Information window here so we can see if there's something going on? Click Help, CTRL+click About Quicken.
The file size isn't an issue now, I'm thinking of preventing one down the road. There's only about 150 stocks. You answered my question by saying "price history file is small fries," so I'm not going to worry about it. Now I have to wonder why there is an option to uncheck that Download Quotes box if they're going to download anyway. Does it do something else?