On some older or underpowered hardware, you may notice the following when selecting viewports, symbols or groups that have a box selection highlighting around them:
This will occur in three cases:
1) Your computer has two separate graphics devices, normally an integrated weaker card and a dedicated powerful card and Vectorworks is set to use the integrated card. This article can help you resolve this issue.
2) Your graphics hardware is below the system requirements. You would need to install a graphics adapter capable of supporting Vectorworks. A list of graphics requirements and suggestions can be found here.
3) Your graphics hardware meets or exceeds system requirements, but has an out of date graphics driver. This article can help you resolve this issue.
Note: As a quick and temporary workaround, you can also go to Tools > Options > Vectorworks Preferences > Interactive and disable "selection highlighting" until you are able to upgrade your graphics hardware.
Edited by JimW