When it doesn't do what you expected...
See also: logging.
These are the Frequently Asked Questions.
There's a much longer list of explanations under Error Messages.
Can't process apostrophes
Is this Russian, Greek or English? strange symbols in display
It doesn't even start!
It takes ages!
Keys don't respond
Line beyond demo limit
Mismatch between Concord and WordList results
No tags visible in concordance
Text is unreadable because of the colours
Too much or too little space between columns
Wordlist out of order
Won't slice pineapples