Hey Paul,
Couple of quick questions for you. Did you install the NI-CAN after installing LV 8.5? Generally you need to install the drivers after you install LV, so that this way the correct folders are placed in the correct areas. Most likely if you reinstall the driver, and make sure that you select support for 8.5, you should see the NI-CAN palette under the Measurement I/O. Otherwise there needs to be some more diggng around to find the root cause of this disappearance.
Can W
Can Wong