Are you on the final 1.15 or latest insiders?

@aeschli this is running from sources, I do not see this hover.

Looks like an exception is logged:

Illegal argument: range: Error: Illegal argument: range
    at Object.illegalArgument (/Users/bpasero/Development/Microsoft/monaco/out/vs/base/common/errors.js:161:20)
    at new ColorInfo (/Users/bpasero/Development/Microsoft/monaco/out/vs/workbench/api/node/extHostTypes.js:978:32)
    at ColorProvider.<anonymous> (/Users/bpasero/Development/Microsoft/monaco/extensions/json/client/out/colorDecorators.js:181:45)
    at step (/Users/bpasero/Development/Microsoft/monaco/extensions/json/client/out/colorDecorators.js:36:23)
    at Object.f [as next] (/Users/bpasero/Development/Microsoft/monaco/extensions/json/client/out/colorDecorators.js:17:53)
    at fulfilled (/Users/bpasero/Development/Microsoft/monaco/extensions/json/client/out/colorDecorators.js:8:58)
    at process._tickCallback (internal/process/next_tick.js:103:7)

@bpasero Can you attach the full file content?

@aeschli here:

{
    "window.zoomLevel": 1,
    "files.autoSave": "off",
    "explorer.openEditors.visible": 9,
    "workbench.editor.enablePreview": false,
    "files.trimTrailingWhitespace": true,
    "files.insertFinalNewline": true,
    "debug.inlineValues": true,
    "git.confirmSync": false,
    "git.enableSmartCommit": true,
    "editor.minimap.enabled": false,
    "editor.renderIndentGuides": false,
    "editor.dragAndDrop": false,
    "search.quickOpen.includeSymbols": false,
    "workbench.startupEditor": "newUntitledFile",
    "window.restoreWindows": "all",
    "window.restoreFullscreen": true,
    "workbench.activityBar.visible": true,
    "workbench.colorCustomizations": {
        "statusBar.background": "#adadad"
    }
}

I'm not even able to get the hover on json files. It works on others like js, css, etc. Anyone else having this issue?

@bpasero Still can't reproduce, also not with your content. Can you enable:
"css.trace.server": "verbose" and see what ranges are returned for colors?
Or I'll debug it on your machine next week.

@aeschli I can reproduce even with a simple example of just opening the settings file directly (in this case a settings.json file within a workspace).

Not seeing any output, where should I look at?

Btw the exception could be a red herring, now I am not seeing the exception anymore but I still do not get the color picker.

@aditp91 Please file a separate issue...

@aeschli I know what is different, in JSON I need to hover over the value, I cannot hover over the color box. The hover works fine once I hover over the string value of the color.