The "extra dirs" settings aren't pref-set specific, but they're supposed to work for all pref sets in all situations. If they're not working for thumbnails, they're probably not working for command line image generation either. That's actually one of the bugs on the list of 4.2 Beta 1 fixes:
(Thumbnails use command line snapshots.)
Are you sure that the LDView.exe you have is the 4.2 Beta 1 version, and not an older version? Note also that the thumbnailer uses the most recently run LDView executable. So even if you install 4.2 Beta 1 and then simply run LDView 4.1 from some other location, the snapshots will be generated using 4.1.
Quote:Fixed command line snapshot generation to pay attention to the Extra Search Directories set via the UI.
(Thumbnails use command line snapshots.)
Are you sure that the LDView.exe you have is the 4.2 Beta 1 version, and not an older version? Note also that the thumbnailer uses the most recently run LDView executable. So even if you install 4.2 Beta 1 and then simply run LDView 4.1 from some other location, the snapshots will be generated using 4.1.