Missing LHD paths for RRW + intersection. Unless this setup isn't supported (It is with STR)
It has paths in RHD, so it is indeed a missing (or broken) path file.
twist2172 and
XL2007, the only components that include slope files are the RRW Slope Settings and the Maxis Highway Override (which affects Ground Highway). Both of those modifications are really primarily driven by replacing tunnel models with the appropriate custom ones (tunnel models are handled by the same exemplar files--Network Tuning Exemplars--as slope settings), though the RRW does include much more restrictive slope properties as well.
No other NAM component in NAM 38 includes modified slope settings for any other networks, and in any case, even if they did, they would be overridden by any other slope mod, provided they are installed in such a location that they would load
after the Network Addon Mod folder--by virtue of coming later than it in the alphabetical order. Note that the file architecture changes made beginning with NAM 37 got rid of the old "z___NAM" folder that was present in NAM 31 through 36, which would load especially late in the load order.
If your slope mods still aren't working, that would suggest that perhaps you may have multiple slope settings in your Plugins folder, and the least restrictive is loading last. Make sure the desired settings are in a "zzzSlopeMod" subfolder within Plugins, or the like. I'll also note that the Mac version does handle load order in a slightly different fashion than the Windows version, but that folder name
should work (though I can't guarantee it).
-Alex