I have a very complicated report (written by someone else) that I am having to make changes to. At the heart of it is a formula that manipulates long strings and counts up occurrances of characters within them. About 30 different characters are checked.
After it has read all the records, it starts 'compressing summaries'. And then, more often than not, it crashes in the middle of that formula. (It isn't linked to any particular record, I've checked that. )
What does 'compressing summaries' do? I can't debug this without knowing, as there is no obvious place that breaks it.

Thanks in advance for any help