Hi Simplymax,
I assume that the main scene-file is in the project-folder as “Sibling” to the tex folder.
As you can otherwise work with the textures, they should be standard and accepted by Cinema 4D.
You have certainly checked your hard-drive if the index/catalog is working.
That the read and write rights for this files have not been compromised by the OS or such.
Go into your back up foolder (I assume you have set up an automatic back up in the preferences), and check previous files, by open them and copy those into the Project fiolder)
.
Perhaps try this, go to the “Edit>Preferences” and set a path for this specific tex folder. In r15 it is under “Files” in the preferences.
Is that working? If not:
Connect just a few, and save that as “Project with Assets”. Open this new project file and check if the previous linked textures are now linked. If so, the original scene file might be in need for a support inspection. But check in any case the new tex folder, does it contain now few or all textures.
Next, if no success:
Close the scene, place the scene file directly in the tex folder, reopen the scene.
If that is not working either, open a new scene file, and copy everything from the original file into it. Save besides the original tex folder and check the textures.
.
If all these options will not work, you need to get into contact with the support: http://www.maxon.net/support/support-questions.html
From the Manual:
Avoid assigning paths that lead to CDs/DVDs or network locations. Searching these paths is most often a very slow process. An error message will only then be displayed if the texture cannot be located in any directory.
Good luck
Sassi