If clicking on an icon gets you the dreaded red arrow, that's a sign that while you have the icon installed, the RUL0 code that is designed to make the content under that icon work is either (a) not present in your Controller file, or (b) is being blocked by an old Controller file that is loading after your NAM Controller (only one copy of RUL0 can be loaded by the game--whatever one comes latest in the load order). Based on some of the recent issues I've seen, I'd lean toward option (a).
First, I'd recommend running the Controller Compiler manually--it's in the
My Documents\SimCity 4\NAM Auxiliary Files\Tools\Controller Compiler folder by default--and try the icons again in-game after doing so. If you're still getting the red arrow, dive further into the Controller Compiler's folder--down to
My Documents\SimCity 4\NAM Auxiliary Files\Tools\Controller Compiler\Network Addon Mod\Controller\RUL0\7000_Road\7A00_NWM. This is the folder that is supposed to contain the RUL0 code for the NWM Starters, Transitions, and Curves. The code for the old TuLEPs is in
My Documents\SimCity 4\NAM Auxiliary Files\Tools\Controller Compiler\Network Addon Mod\Controller\RUL0\0000_TuLEPs_CanAM (specifically, a file called "0600_NWMTuLEPs.txt").
If those folders don't exist, or are empty/missing key files, then I would recommend re-installing the NAM at that point. If they are there, however, that would suggest there's either something up with the Controller Compiler's settings (check to make sure the "Network Widening Mod" box is indeed checked), or that there's an older (pre-NAM 28) copy of the RUL0 file (possibly an old NAM Controller, or an ancient pre-NAM file that modified RUL0). The NAM is supposed to seek-and-destroy such files (routines in the installer script and the built-in Cleanitol), but if the file was introduced post-NAM install, or the seek-and-destroy routine failed (which is possible), it would still be there.
The easiest way to locate a conflicting RUL0 file would be to load up ilive's Reader, open the NetworkAddonMod_Controller.dat file in Plugins\Network Addon Mod (actually, any file will work), go to Tools > Plugins Analyzer on the menu, find "NetworkAddonMod_Controller.dat" on the list, and look at the results in the right pane of the window. If the RUL file with the IID 0x10000000 (this is the RUL0 file) shows up in some shade of blue/teal/cyan, this indicates there is a conflict somewhere, and it will list all places where RUL file 0x10000000 exists in your Plugins folder. You can then easily find and remove the conflict.
ebina's thread
here (sadly missing its images) describes this process in more detail.
Hope that helps!
-Alex