I was working on a character using mirror mode. I then created a separate object and joined it to the main mesh. However, after I tried moving this object, a few vertices from the end of the mesh would jump to the mirrored portion of the character:
I tried replicating this effect in other files, but it didn't always happen.
Is this a bug? Is anyone else experiencing it?
Note: This was in blender 2.77, with on additional plugins installed. The mesh had a subsurf modifier on as well, but the jumping occured even if I removed it.