I can confirm that rendering above around 15,000x11,500 causes TG2 to sit at "preparing to render" for what appears to be forever. It doesn't crash for me, it just never gets beyond "preparing to render". Use of crop render does not help, probably because with crop renders you still need the same size image buffers as with a non-crop render.
I'm not sure of the source of this issue or whether it can be easily fixed (some artificial internal limit, a hard-coded buffer size that's in place for safety check, etc.). But we'll look into it. In the meantime it looks like your max render resolution is around 15,000x11,500. At 300DPI that still gives you an image over 4 feet wide though. Hopefully that will be enough. If you need more, you could consider rendering at a relatively high detail (detail 1, let's say) and then upsampling with a good resize tool. This is commonly done for billboard images, for example.
- Oshyan