Hi Robin,
We have had a couple of cases with people with this NVIDIA Graphics card with the same problem (not being able to use a Custom model for classification). The 6GB VRAM of the GPU is below the recommended 8GB. The Quadro GPU is quite old now too, so there may be an incompatibility of CUDA versions (e.g. we might be needing a version later than what is compatible with the Quadro series it's ~7 years old now).
What happens when you complete the Analysis step? What values are returned for Epochs/Batches/Samples?
Reducing these down may help.
------------------------------
Brendon Edge
Geospatial & BCFS Director of Support
------------------------------