You stand a better chance at getting a useful response if you explain what "drop down menus" means to you...
- Data Validation?
- ComboBox activex?
- ComboBox Forms?
- AutoFilter custom?
- Pivot Table field filter?
- Custom command bar menu?
- UserForm?
- Something else?
Also, what did you do reasonably immediately before noticing this "pale blue outline", did you run a macro, filter a range, chant an evil incantation, or something else.
Finally, it is always useful to include the version of Excel you are using and the operating system version.