@AndyB , and everyone else:
For this issue - there is a workaround. Please try adjusting your player character’s z-axis, or height. Stand on a barrel, or a pillar, or a desk, and then try to place your placeable. Here is an example:
Cannot move the weapon rack in to where I want:
Climbed a shelf on the wall, sufficiently changing my z-axis (elevation) position:
After adjusting the z-axis position of the player character, the weapon rack placeable is successfully moved:
Hopefully too - this feedback will make it back to the Funcom devs through the @Community team so that they can make progress to perform corrective measures.