Nodes are not displaying in Hypermesh

Recently we installed Hyperworks 12.0 on our office machines.On one machine we are facing an issue with Hypermesh, where the nodes are not getting displayed at all - not just temp nodes of an FE model, but even newly created nodes. Please note that we are able to select nodes by ID, diplay node numbers & even using 'count' function we are able to count all nodes in the FE Model - the problem is that Hypermesh is not diplaying them, i.e. we are unable to see the round yellow dots representing the nodes.

This issue is however limited to only one system - on other machines it is working fine. Can anyone help us know what is causing the issue & how to fix it?