Firstly, please ensure you are running the latest version of Lynx, as older versions are known to have issues.
Secondly, this problem can be caused by a corrupted registry entry. If you close Lynx and then delete the following registry key, the display will reset to default:
Computer\HKEYCURRENTUSER\SOFTWARE\Lynx\4\Lynx::UI::Controller
Care should be taken when editing windows registry keys. Ask an IT professional to carry out the task if you are unsure.