Weld Point NOT selecting

[Xephus]

I am Using XSI 2010.
I can to go the weld point via Modify/poly.mesh/ Weld Point Tool
But I get no response when it comes to actually moving the points.

It has to be a setting or something, but I can not find an answer on Google or the XSI help.

Please. somebody help me to fix this issue.

[Xephus]

Select > Select Adjacent submenu is greyed out

[Xephus]

so the actuall WeldsPoints command, isn't being triggered.
if i copy/paste this into the script editor

WeldPoints "cube.pnt[4];cube.pnt[5]",

itworks and points 4 and 5 are welded together together.

and the script changes to this;

WeldPoints "cube.pnt[4];cube.pnt[5]", siPersistentOperation

[Xephus]

I fixed the issue.

The Video card drivers had to be re-installed. that fixed the menu btn issues.