Hi @Datasavvy
Please refer to OssieMac's suggestions to have a check first.
- What is the format of this workbook? For example: .xls, .xlsx, .xlsm format.
If it is a .xlsm format file with macros, it is recommended to save it as a normal .xlsx file, and then set the background color.
If it is a file without macros (like .xls, .xlsx, etc.), please forgive me for wanting to verify, how did you check the conditional formatting formula.
(Please select one pink cells and go to the "Home" tab > "Styles" group > Conditional Formatting > Manage Rules to check whether there is a conditional format formula. - It is recommended to back up the file, create a new blank workbook, and then open the test file and the blank workbook;
Copy these cells to the blank space, only keep the values, and then copied back to the original file, only the value are still kept. - If none of the above operations work, you can try to click in Excel: File> Options> Advanced> Under editing Options, uncheck "Extended Data Area Format and Formulas" > OK.
--------- Update --------
I have checked the file, conditional formatting formula is indeed used.
To change the pink, you could delete the rule.
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