I am trying to increase the memory limit to my raster options and it wont let me change the size. I have plenty of available memory(mb) to use, but after i restart civil 3d and go back to the same options menu, its back to what it was...
any ideas as to why?
I don't have an answer for you. It may be a Map Administrator or a file/folder permission issue. I am able to change my settings. You might get a response from the Map forum, though some Map users watch this forum as well.
You can always file a support request.