Questions:
1. Is this device one you have owned and used yourself for some time or is it one you have picked-up secondhand from some unknown seller? I only ask as there are sometimes devices floating around in the market that have been 'improved' (in other words, fecked up) or tampered with by other 'careful' previous owners. Or some that just do not work and have been then been offloaded into the market by previous owners who cannot be arsed to get the device mended.
2. Is this a new phenomenon? In other words, have you been able to save routes you have built in the device into trip planner before? Or is this the first time you have tried and it's failed?
3. Is all the software up to date and properly installed?
4. Is the route possibly appearing way down a list of unscheduled other routes, so that you just can't see it without scrolling down?
5. Can you create a route in BaseCamp / Mapsource (or some other third party software, if you must) and get that to save into trip planner?
6. Have you tried (and this is usually a last resort, not the first course of action) saving the data on your device onto your home computer and then doing a hard re-set on the device?
Await your words on all six points.
Thanks you.