In Land Desktop 2008, there appears to be an issue with loading shape files in some drawing files. When opening files which contain complex linetypes, the accompanying shape files are not loaded. Consequently, complex linetypes appear to be dashed.

Workarounds: Manually load the linetypes after opening the drawing. This can be automated by adding the appropriate code to your acaddoc.lsp. The following snippet is an example of how you can load all of the linetypes in specified LIN files. If you're a clean freak, though, you would probably want to purge afterwards. This is just a workaround, though. Hopefully Autodesk will provide an actual fix.

(SETQ experto (GETVAR "expert"))
(SETVAR "expert" 3)
(SETVAR "cmdecho" 0)
(PRINC "ACAD.LIN file ... ")
(COMMAND "._linetype" "l" "*"  "acad.lin" "")
(PRINC "loaded")
(PRINC "AECCLAND.LIN file ... ")
(COMMAND "._linetype" "l" "*"  "aeccland.lin" "")
(PRINC "loaded")
(PRINC "COMPANYCUSTOM.LIN file ... ")
(COMMAND "._linetype" "l" "*" "COMPANYCUSTOM.lin" "")
(PRINC "loaded")
(SETVAR "expert" experto)
(SETQ experto nil)
(PRINC)

First Appeared: Land Desktop 2008
Status as of 2008 SP2: Still reproducible.
Status as of 2009: (unknown - please email with any info)