Do you have the files? IES lights are separate files containing information about different light-styles. To get it show in the renders you have to choose a file from the IES menu. Which version of V-Ray is it?
If it worked correctly before and doesn’t function now, there might be a change in the settings somewhere in the menus. I’d suggest to revert all V-Ray settings back to default and see if it fixes it. You might’ve accidentally clicked an option to show only environmental lighting or something similar.
Also, try again with a new SketchUp file. Sometimes the old V-Ray would mess up the SketchUp models.
Also, if camera values have changed, the intensity/multiplier should be changed accordingly.
The intensity value differs depending on the IES file you use, and the camera exposure settings, but I have actually used something like 10000 or more in the intensity before…