Does your machine has a supported graphics card and enough memory?
Does it happen with only one drawing?
Have you tried recovering it?
What about geometry being far from point 0,0,0?
We are currently having the same issue and are yet to come up with a solution.
Details as follow:
Problem: ECW image shifting within paperspace layout. Problem only with viewports which have been twisted.
Windows 7 64bit
Quadro 2000 (on the supported list)
Using Civil3d 2012
Have tried recovering... moving the geometry is not an option.
Have also tried toggling "Projection" on and off as suggested in other threads
This seems to have been a long standing issue and its surprising there yet seems to be a fix
have you tried to convert the ECW into a TIF&TWF and use this fileformat to reference your geo-raster?
- alfred -