If your database exhibits problems, but you're just not sure what recent changes you've made that could have caused these problems, you can use to find out.
Open your database with 4D Insider and select 'Search...' from the Tools menu (Control-F/Command-F). In the dialog box, select "Date", "is after", and enter a date. The date you enter should be BEFORE your database began exhibiting the problem(s). When you click "Search", 4D Insider will display a listing of all of the objects in your database that have been modified since the date you entered. Now that you've narrowed the playing field by reducing the number of objects (forms, methods, etc) you made changes to, you should find it easier to identify specifically which change(s) are the cause of the problem(s).