Response:

You might expect quite different results if you’re testing with US dollars but actually running with pound sterling, especially if currency conversion is involved.

Reference:

• Step 23 – Environment?

Related questions:

• Has it happened before?
• Have you started everthing?
• Have you turned it off and on again?
• Is debug on?
• Is it a hardware problem?
• Is it turned on?
• What language are you using?
• Who, how, why, what, when and where?