Currently Being ModeratedOct 23, 2012 10:56 PM (in response to Adam Simmonds)
I wouldn't surmise that at all from your subject line—crashing is, after all, a response.
While reinstalling might solve the issue, I doubt that it is a necessary step. Does Numbers exhibit the same response if you open it (on the same computer) using a different User Account?
If not, then the most likely culprit is a corrupted preferences file.
In the Finder (and logged on with the account where the issue exists), press and hold the option key, go to the Go menu, and choose Library.
In Library, open Preferences, and locate the file com.apple.iWork.Numbers.plist
Drag this file to the desktop (or the Trash), the relaunch Numbers and try adding a sheet to a Numbers document.
If successful, trash the old preferences file and carry on.
Currently Being ModeratedOct 24, 2012 2:49 AM (in response to Barry)
Thank you very much for replying. Yes, the question did go off in a different direction - I was interrupted in between writing the title and the body and was half on the phone when I wrote it.
I solved it myself by copying and pasting each of the sheets from the document into a new one and then added a new sheet and all was fine - so perhaps it was just the original file that was corrupted?
Either way, thank you. And I like the tip to get to the Library. Didn't know that one!
Currently Being ModeratedOct 24, 2012 8:35 AM (in response to Adam Simmonds)
"so perhaps it was just the original file that was corrupted?"
Sounds likely, from the described behaviour. I missed that possibility. Glad you caught it.