Understanding Ghostscript Errors in Vault

How does Ghostscript work with Vault?  What do Ghostscript related errors mean?  I see things like this in the render log:

11:03:00 <render1> Error: /undefined in --run-- 
11:03:00 <render1> Operand stack: 
11:03:00 <render1> --dict:10/11(ro)(L)-- --dict:10/11(ro)(L)-- --dict:10/11(ro)(L)-- --dict:10/11(ro)(L)-- --dict:10/11(ro)(L)-- --dict:10/11(ro)(L)-- --dict:10/11(ro)(L)-- --dict:10/11(ro)(L)-- --dict:10/11(ro)(L)-- --dict:10/11(ro)(L)-- --dict:10/11(ro)(L)-- --dict:10/11(ro)(L)-- --dict:10/11(ro)(L)-- --dict:10/11(ro)(L)-- --dict:10/11(ro)(L)-- --dict:10/11(ro)(L)-- --dict:10/11(ro)(L)-- --dict:10/11(ro)(L)-- --dict:10/11(ro)(L)-- --dict:10/11(ro)(L)-- --dict:10/11(ro)(L)-- --dict:10/11(ro)(L)-- --dict:10/11(ro)(L)-- --dict:10/11(ro)(L)-- --dict:10/11(ro)(L)-- --dict:10/11(ro)(L)-- --dict:10/11(ro)(L)-- --dict:10/11(ro)(L)-- --dict:10/11(ro)(L)-- --dict:10/11(ro)(L)-- --dict:10/11(ro)(L)-- --dict:10/11(ro)(L)-- --dict:10/11(ro)(L)-- --dict:10/11(ro)(L)-- --dict:10/11(ro)(L)-- --dict:10/11(ro)(L)-- --dict:11/20(ro)(L)-- --dict:10/11(ro)(L)-- --dict:10/11(ro)(L)-- --dict:10/11(ro)(L)-- --dict:10/11(ro)(L)-- --dict:10/11(ro)(L)-- -- 
11:03:00 <render1> Execution stack: 
11:03:00 <render1> %interp_exit .runexec2 --nostringval-- --nostringval-- --nostringval-- 2 %stopped_push --nostringval-- --nostringval-- --nostringval-- false 1 %stopped_push 1905 54 4 %oparray_pop 1904 54 4 %oparray_pop --nostringval-- 
11:03:00 <render1> Dictionary stack: 
11:03:00 <render1> --dict:1159/1684(ro)(G)-- --dict:0/20(G)-- --dict:115/200(L)-- 
11:03:00 <render1> Current allocation mode is local 
11:03:00 <render1> Last OS error: No such file or directory 
11:03:00 <render1> ERROR 97002: unable to start Ghostscript, code [-100] 

Causes will vary based on the specific error message obtained, but in general it's worth knowing that whenever a Postscript document is viewed in the Vault client or rendered as PDF, Vault calls Ghostscript.

Ghostscript automatically gets installed  along with Vault.

Common problems are:

The version of Ghostscript bundled with Vault may not be compatible with the specific postscript document being viewed.  In this case it may be possible to manually update Ghostscript to a later version.  Contact technical support for help with this.

Sometimes the Postscript file is missing fonts or images and this can cause a Ghostscript related error.

Sometimes the resource set used by the job is incomplete or missing, and can cause a Ghostscript related

Sometimes the Postscript file is referencing a path that does not exist.
Environment Details
Vault 5.3, 5.4, 5.5, 6.0, 6.1, 7.1. all platforms
UPDATED:  October 28, 2015