I created a form which has 5 control tabs at the top. It used to work just fine, but now the tabs no longer appear in form view, though they still appear in design view. I have checked the properties of the tab control, and "visible" is set to yes, and "display when" is set to always.
I am not sure what it is, but sometimes you have to save the form in design view(when you can see them), then goto form view, and if you can see them still save the form again. Close the form open again and it should be fixed. I have found that is a weird deal with access sometimes.