Errors in details panel but no underline or gutter marker

[wesleymcelwee]

I've recently started working with api-workbench in Atom. If I have any code errors, intentional or otherwise, I'm not seeing any underlines or gutter indicators. If my cursor is in the line with the error, it is displayed in the Details pane (I assume this is from linter).

Things I've tried

disabling all packages except api-workbench, linter, linter-ui-default, busy-signal, intentions
uninstalling/reinstalling linter
Installing an old version of linter (2.0)
resetting config.cson
moving /.atom folder

I've searched here and google and found similar reports but many of them are old and/or the solutions didn't help. This has the feeling of a setup issue rather than a bug but I'm not sure where to look to get this resolved beyond here.

Win 10
Atom 1.41.0 x64
api-workbench 0.8.48
busy-signal 2.0.1
intentions 1.1.5
linter 2.3.1
linter-ui-default 1.8.0

UPDATE: No errors in the developer console either. If I can provide other debugging info, let me know.

[steelbrain]

If there are no errors anywhere, then maybe, possibly the provider is providing incorrect ranges that are not possible to be paint on the editor (out of bounds? zero length?)
If you need some pointers on debugging, I would advise cloning the linter provider repository locally and adding some console.logs around it's return value to see it's ranges and manually verifying if they seem appropriate.

Also It's been a while but I don't remember the Linter panel to look like what's in the photo, maybe I'm just growing old? :)