A new NetRadiant build is available on

http://rid.icculus.org/netradiant/files/netradiant-1.5.0-20120114-win32-7z.exe

The builds by default are in sRGB; the build menu provides "nosRGB" options to
do old-style light compiles.

To continue to use non-sRGB on the build service, add -nosRGB to your
.map.options file.

In case you don't see the new build options, please hunt down a file called
"build_menu.xml" in your NetRadiant settings dir (Unix:
~/.netradiant/1.5.0/xonotic.game/, Windows: Application
Data\netradiant\1.5.0\xonotic.game) and delete it before starting Radiant
again).