CShop and Cylinders

I'm using the demo version of CShop to see whether I like it for my primary .dif tool. I've got a pretty simple level and TGE crashes to the desktop with a Windows error when I choose Relight Scene.

I've narrowed it down to a cylinder. When I add a cylinder primitive, even with only 8 sides, I get that crash when I relight the level in Torque. If I create a brand new CShop file with just the cylinder in it, export, then import that to TGE and relight, I get the same crash.

There's no error or warning on export from CShop. I'll paste the export readout at the end of this.

Has anyone else had this problem? How do I fix it? I like CShop so far compared to Quark, but if I can only use cubes with it, it doesn't do me much good. :-)

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Reading CSM v5.
Performing fixups on CSM geometry.
Converting CSM to MAP.
Texture smartcopy.
Parsing map.
Creating BSP.
Marking active zones.
Creating surfaces.
Processing lightmaps.
Grabbing surfaces.
Processing surfaces.
Creating shadow volumes.
Processing emitter BSPs.
Lighting 16 surfaces...
6.25%
12.50%
18.75%
25.00%
31.25%
37.50%
43.75%
50.00%
56.25%
62.50%
68.75%
75.00%
81.25%
87.50%
93.75%
Processing alarm lighting.
Sorting and packing lightmaps.

Statistics:
- BSP
+ total nodes: 33
+ max depth: 16
+ avgerage depth: 8.94118
- VIS
+ empty leaves: 16
+ avgerage links/node: 5.75
+ max links/node: 14
- Brushes
+ total: 1
+ structural: 1
+ detail: 0
+ portal: 0
- Lightmaps
+ sheets: 1
+ lumels: 1012
+ border pixels: 0
+ sheet pixels: 2048
+ efficiency: 49.41%
+ uncompressed bytes: 6kb
- Number of zones: 1
- Number of surfaces: 16
- Ambiguous brushes: 0
- Orphaned polygons: 0

Exporting to runtime.
Writing 'D:\RPG\TheJourney\JourneyFiles\data\interiors\TempleComplex\cylinderTest.dif'.
Done!