Hi Mark,
I know this thread is a bit old, but I’m having a nightmare relinking textures in my project; the way C4D handles textures is appalling and feels more like version 1 than version 18. You said “select all the missing textures”…I can only select the textures one at a time in the Edit menu > Project Info > Textures panel. Is that where you’re selecting the textures?
I’ve set the project’s prefs to look at the proper folders, but C4D just ignores this completely – I’ve never seen any use in setting those folders in the prefs, it achieves absolutely nothing.
I seem to recall a better way to batch relink textures that I saw a year or so ago – not this silly Project Info > Textures way.
This is what I’m ploughing through:

…the procedure is:
1. click ‘Mark Missing Textures’ to show the green ticks and red crosses
2. click on a missing image file (eg. Person1_Top_Diffuse.png)
3. click on the … to locate the file
4. locate the file
5. click Yes when C4D asks if I want to replace it in the whole project
6. click OK when C4D tells me the texture’s been replaced
7. click ‘Mark Missing Textures’ to show the green ticks and red crosses
….and start on the next texture image.
There is no way to select more than one texture image in the list, even though they’re all in the same folder on my drive. Or is there a better, more efficient way?
Thanks in advance for any suggestions!
~ Paul
motion graphics | VFX | web design | etc.
https://paulroper.com/