Hi,
For me, routing to the Plutoniumweg doesn't work at all - but my Mapsource is older than yours, I could not read your Plutoniumweg.gdb (MapSource complains about the file being newer).
I am using the latest version (as downloaded by the "check for software updates" option on the help menu).
"Utrecht, we have a problem" ;)
I was thinking about trying to synchronize the vertical split line (i.e. have both maps split at 0x39000, just to make sure that's not the problem.
Could be worth trying to see if it changes anything.
Oh, btw: the reason I found this strange route is that a much longer inter-tile route, from my home in Zaandam to my parents in Houten, made a weird deviation half way (went off the A2 for no reason, somewhere above point A); also, a route to my wife's family in Culemborg could not be calculated at all.
Yes, it's not specific to that particular piece of road. It must be a general problem with being unable to route across a tile in certain circumstances.
Just to be sure, I'll check my Nüvi this evening.
Please do, it would be useful to know if a real GPS has the same problem (my guess is that it will). Cheers, Mark