In a virtual desktop session environment, dumping env in a terminal window shows that LD_PRELOAD is empty. Any previous content (for example: VirtualGL interposing libraries) is cleared out.

As a workaround, run the following command to disable EGL capture:
$ sudo /usr/NX/bin/nxserver --eglcapture no

This will set the following key in node.cfg:
EnableEGLCapture 0

(note that since v8 EnableEGLCapture is enabled by default. In v7 it is instead disabled).