Which airplane you were using ? Does it happen with a default airplane ?
Also, which traffic package are you using ? Does it happen with lower traffic settings ?
The problem is surely not the scenery, also because nobody else reported it before, and Zurich is both our older scenery, and our best selling one.
Sometimes, it's easy to be misled into thinking the scenery is a problem because "all other airports works".
An explanation for a problem like this is, for example, a corrupted texture for an AI airplane that is found only at that airport so, one can think the problem is the airport scenery, when it doesn't have anything to do with it.
Another issue might be: if the airplane you are using it's just on the *bordlerline* to exhaust your memory, it would be enough to add very small additional load, even a moderately complex scenery, and you just cross the border of memory exhaustion. That's why I've asked to check with a default airplane.
Also, it should be checked if it happens only after a long flight ( 1 hour or more ), or it's consistent and easily replicable even after a few minutes. If it happens only after a long flight, and it happens only with a specific airplane, that might be caused by a memory leak in one of the gauges.