Should I try a re-install? It had been working fine for all these years and just started randomly moving walls and objects whenever I zoomed out or to another location.
Gelöst! Gehe zur Lösung
Gelöst von Lance.Coffey. Gehe zur Lösung
Thank you for the question @Anonymous, and welcome to the Autodesk forums!
If this behavior is specific to a particular project(s):
I’ve seen behavior like you are describing when the extents of a model exceed the 20 mile limit.
Sometimes this happens when linking in other files (like DWGs). If you have links loaded, try unloading these.
Try going through the following steps:
I also found this forum thread with a different option/workaround: Revit 2018; 3D View jumps around, and wont zoom

Been exploding any CAD lately? Bet you $10 that you got CAD elements in a galaxy far, far away from the Internal Origin (e.g. more than 10 miles away).
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