How did you do the install? Did you remove all files before uploading RC3? Also it COULD be a permission problem, maybe permissions have changed.
I just uploaded the files and set it to overwrite all files. The same way I have always done it. Never had any problems with the navgroups disappearing anywhere from Beta 4 - RC2. What kind of permission problem?:ermm:
EDIT: Okay. I think I have fixed the problem. Well, I dont think I have, I know I have, but I'm not sure why it was a problem in the first place :ermm:
Okay, so I was playing around the with nav XML files and by changing <navgroups product="vBulletin"> to <navgroups product="vbulletin"> (ie. the "b" in vBulletin to lower case) the navgroups re-appeared.
What if <navgroups product="vBulletin"> and they still dont show up? Some of the missing navgroups do not have a product associated with them (ie. the old ibProArcade 3.5 version and the PayPal donations system) and they all use <navgroups product="vBulletin"> :S
vBulletin != vbulletin
It must be vbulletin.
(Think I did that wrong in my How-To ... checking)