Other things to try:
1.)Set your limits to iclude everything in the drawing.
2.)Re-Boot your machine.
3.) Update your video drivers.
4.) Do a "Repair-Install".
HTH
ACADuser
Civil 3D 2018, Raster Design 2018
Windows 7 Enterprise
Dell Precision 5810 Workstation
Intel Xeon E5-1630 v3 @ 3.70GHz
32GB RAM, NVIDIA Quadro K2200 4 GB GDDR5
DUAL 27" Dell UltraSharp U2713HM