I just spent most of the weekend trying to solve my DWG linetype problem. I couldn't figure out why some exported DWGs had no problem with line types while others did.
For what its worth, it was the Greek, stupid: Any drawing layout with a Greek title produced a SHX file with a scrambled title, which TrueView couldn't understand or find. This also explains why none of the Archi-Talkers could figure out what the heck my problem was.
In general these kinds of language problems are new in Windows 10. They seem to have changed the way non-English alphabets are handled and there are still a lot of issues. PDF or DOC Files with Greek names created in older versions of Windows will sometimes fail to open in WIN 10.
David Collins
Win10 64bit Intel i7 6700 3.40 Ghz, 32 Gb RAM, GeForce RTX 3070
AC 27.0 (4001 INT FULL)