Linux LXDE not displaying Arduino icon on application bar

I’ve searched here and find only very old posts, and not specific to my issue. Posted similarly yesterday, but in the wrong place – sorry.

In Linux (Fedora 15) when I edit the application bar to add Arduino, the little icon shows up there, but when the Arduino link is actually ON the task bar, there is only a red circle with a slash through it (indicating- icon not found, I would guess). The link works fine, but looks ugly.

If this is something I (we) can fix in some file, could you let us know –

  1. where the icon is located and

  2. the name of the icon file and

  3. what file we can check to find the problem.

I know it’s there somewhere or it wouldn’t show up in the application bar editor.