Purple box in Calc

Occasionally, when using Calc, a purple box appears around a group of cells. Arrow keys will then only move around within that box, and I am unable to interact with any cell until I reopen the file. What is this, how am I triggering it, and how can I back out of it?

Post a picture of this occurrence.

calcerror

Hi @MadnyeNwie, unfortunately I couldn’t identify the problem visually. Would it be possible to post an example file?