"go to" Dropbox unexpectedly appears

[richarddawson]

I am writing a large programme - far too big to post - and, after it runs through two or three reiterations, it starts to put a standard "Go To" Dropbox up. I have no idea what is causing it - there is nothing in my code calling for that to happen.

Please can anyone suggest what might be happening?

 

[mole999]

office 365 ?, can't of any other reason a bog standard excel would want a cloud to save the file in