I upgraded my project from 2.6 to 3.3. I can’t seem to get the icons for lights, cameras, etc. to show up in the scene view. I don’t think it’s a problem with layers unless I’m missing something. I can select the objects in the Hierarchy but it’s becoming a pain. I do, however, see these icons when I start a new project. Anyone have an idea what’s going on?
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UPDATE:
I upgraded to 3.4 and reupgraded my project from 2.6 to 3.4. I’m getting the same problem. I thought the new icon controls in 3.4 might help out but they just seem to reveal something funky is going on. Here’s another picture showing what I mean. As you can see, I have a light selected, and I have the icon dropdown with the light icons set to “on” but they aren’t showing up:
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Very weird, no clue what may be causing this. Doubt anyone can help you though, unless it's a more common bug then I suspect it is. All I can advice you is the boring advice of sending in a bug report. Be as clear as you can and add in a project folder as small as possible that still reliably replicates the problem. They usually get back to you fairly quickly. In the editor you go Help > Report a Bug.
– anon73820239