The setting "Preferences | Advanced | Display | Image to display when no album art can be found" uses an absolute path. The issue with this is that it is unsuitable for self-contained portable installations where the device path shifts from computer to computer. May I suggest the following improvements to the "no image" image (in order of priority)...

-The path can remain as an absolute path (as not to break the setting for people that already have it set) but should also accept a relative path, relative to the location of the FB2K folder that is. (One can determine if it is a relative path by checking for "*:\" or "*\\" (UNC) which both are absolute paths, anything else can be assumed to be relative, e.g., "images\noimage.jpg".)

-When the setting is blank, the "no image" could assume the value "noimage.jpg" (i.e., a relative path).

-There could be specific "no image" settings for each of the 5 image options (i.e., a setting for "Front Cover", "Back Cover", "Disc, Artist", and "Icon").

-Each specific image setting could possibly (but I'm not convinced about this) assume their own values when they are left blank (e.g., "nofront.jpg", "noback.jpg", "nodisc.jpg", "noartist.jpg", "noicon.jpg").