Anonymous:
Which is correct? Therein lies the problem. or, Therein lays the problem.
Therein lies the problem is the correct expression.

The Microsoft spell checker sometimes suggests lays, but this does not sound right to the ear! The spellchecker can get a bit befuddled like this sometimes.

If the problem occurred in the past you would say Therein lay the problem.

- Nick
Junior Member58
Anonymous:
Therein lies the problem
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