When changing the Owner field, it is very easy to accidentally end up in the User record of the Owner- frustrating!! Why? The first step in changing this field is to click on the search icon (magnifying glass) to view a list Users to select from. The issue- It is very easy to accidentally click on the User's name instead of the search icon. Now you're in the User's record and need to navigate back. Ugh!
Quick Tip: Use the ASSIGN command instead.