Hi folks. Came across a really strange error today. I was able to devise a workaround, so it's not a huge deal for me. But I could see it halting less experienced users (schools etc) in their tracks, so I figured I should let you know.
Basically I created a set of objects including a simple rotated stretched cube. No crazy objects - no shape generators or imported STLs - were used.
When this set is grouped or exported, the dimensions of one cube change dramatically and it becomes a really long object.
Picture below. Left is the set of objects, with the troublesome one in red. (it was created the same way the others were - replicating and rotating a bunch of stretched cubes) If you group the objects you see the thing on the right.
If you want to investigate further, here's the thing: