Does the whole app hang (so no response to camera rotate etc) or does it seem like it's waiting to load forever (you can still edit already loaded models rotate the camera etc).
If it's the second thing it could be your pc is just still busy prepping / rendering. The ortho mode can be quite a bit slower with rendering due to the fact edges are rendered for everything all the time ( no depth, so no max render distance. Loading datsville can take quite some time on older hardware (it's loading/prepping >450MB of stuff)
If it's the second thing it could be your pc is just still busy prepping / rendering. The ortho mode can be quite a bit slower with rendering due to the fact edges are rendered for everything all the time ( no depth, so no max render distance. Loading datsville can take quite some time on older hardware (it's loading/prepping >450MB of stuff)