D:\quake3\gtkradiant1.2>"D:\quake3\gtkradiant1.2\q3map_2.5.3_win32_x86.exe" -fs_basepath "D:\quake3" -fs_game "tc_dev" -light -custinfoparms -fast -fastbounce -patchshadows -v -bounce 2 "D:\quake3\tc_dev\maps\tc_dx2.map"
2.5.3
2 threads
Q3Map         - v1.0r (c) 1999 Id Software Inc.
Q3Map (ydnar) - v2.5.3
GtkRadiant    - v1.3.5-dev Mar  6 2003 20:31:29
One compiler to rule them all
--- InitPaths ---
VFS Init: D:/quake3/tc_dev/
VFS Init: D:/quake3/baseq3/

--- Light ---
Custom info parms enabled
Fast mode enabled
Fast bounce mode enabled
Patch shadow casting enabled
Radiosity enabled with 2 bounce(s)
Map has shader script D:\quake3\tc_dev\maps/../scripts/q3map2_tc_dx2.shader

All goes fine....

--- IlluminateRawLightmap ---
0...1...2...3...4...5...6...7...8...9... (228)
        0 luxels illuminated
--- IlluminateVertexes ---
0...1...2...3...4...5...6...7...8...9... (1)
    46538 vertexes illuminated
   251901 lights plane culled
   743272 lights envelope culled
        0 lights bounds culled
  3960827 lights cluster culled
--- StoreSurfaceLightmaps ---
Subsampling...collapsing...sorting...allocating...storing...
writing D:\quake3\tc_dev\maps\tc_dx2/lm_0000.tga
projecting...WARNING: Couldn't find image for shader tc_dx2/textures/tc_dx2/concrete5a_d/0022
done.
  1634148 luxels used
  1638400 luxels stored (99.74 percent efficiency)
     2451 identical surface lightmaps, using 113952 luxels
        0 vertex forced surfaces
        0 vertex approximated surfaces
      100 BSP lightmaps
      101 total lightmaps
      507 unique lightmap/shader combinations
--- WriteMapShaderFile ---
Writing D:\quake3\tc_dev\maps/../scripts/q3map2_tc_dx2.shader...
        3 custom shaders emitted
Writing D:\quake3\tc_dev\maps\tc_dx2.bsp

--- Radiosity (bounce 1 of 2) ---

And so on. Works normally.

but using 2.5.4 test or 2.5.4 release... it crashes during compile, it does write out the lightmap tho..

--- IlluminateRawLightmap ---
0...1...2...3...4...5...6...7...8...9... (235)
        0 luxels illuminated
--- IlluminateVertexes ---
0...1...2...3...4...5...6...7...8...9... (1)
    46774 vertexes illuminated
   251905 lights plane culled
   742371 lights envelope culled
        0 lights bounds culled
  3961278 lights cluster culled
--- StoreSurfaceLightmaps ---
Subsampling...collapsing...sorting...allocating...storing...
writing D:\quake3\tc_dev\maps\tc_dx2/lm_0000.tga
projecting...

Bang dr watson.

Application popup: q3map_2.5.4-test-2.exe - Application Error : The instruction at "0x0042c04b" referenced memory at "0x135b6dec". The memory could not be "read".

2.5.4 crashes at the same spot during the output, 0x0042c1db