Any idea why when I create shapes with the marquee tool, some edges will either be faint, or non existent? Yet When dragging the shapes around with the cursor, the edges will become visible again while others will disappear. This has never happened before. I'm using CS3. The same happens when I use the pen tool, rounded rectangle tool, polygonal lasso etc.
See this image...
Could you provide some screen captures and describe what your doing what you show look more like strokes on a layer Then shapes. You make shapes with the shape tools and the pen tools. You can also use these tools to create path path can be converted to selections and selections to paths. Both Selections and Paths can be stroked.
Selections can also be fethered.