From the wiki article "Fallout NV Mod Conflict Troubleshooting" checklist section:
* If you are having a "texture" problem, check you have "ArchiveInvalidation" enabled.
** Open your mod manager.
*** [Mod Organizer] (MO): Select your "Profile". Turn on "Automatic Archive Invalidation" in the "Configure Profiles" dialog. Close the mod manager.
*** [Fallout Mod Manager] (FOMM): Depending on the version you have, find "Archive Invalidation" either under the tools tab or find the button "Toggle Archive Invalidation".
*** [Nexus Mod Manager] (NMM) or the newer "Fallout Mod Manager - Forked" (FOMM): if there is a "check mark" shown next to "Archive Invalidation", remove it and close the mod manager. Open the mod manager, open the "Tools" and place a "check mark" next to "Archive Invalidation".
***: If there is not a "check mark" next to "Archive Invalidation", place one there and close the mod manager.
*** [Wrye Flash] (WF): click on the "Installers" tab, then right-click on the "Package" column header (gray bar) and click to place a "check mark" on the "BSA Redirection" context menu entry. Then right-click on the "Package" column header again and select "Anneal All".
** For other texture problems, see the [TESTG Troubleshooting] section.
Whenever you are in doubt, it won't hurt to toggle ArchiveInvalidation off and then back on.
Edited by dubiousintent, 22 June 2016 - 11:37 AM.