Can you try this?
Start AC3D from the command line with "ac3d -debug", create a shape, texture it.
"touch" the texture file to see if the debgging info reports that the texture reloads.
use:
Code:
copy /b test.jpg +,,
where test.jpg is the name of your texture file.
Each time the file is touched, the texture should reload into AC3D and be reported on the debug output.