I've been trying to book a November flight over errorplan, and keep getting the following message:

The following field is blank/missing: Leaving on.
– The following field is blank/missing: Returning.

The fields are NOT blank or missing. No matter what I do, click the calendar or enter manually, I get that stupid message, and am unable to proceed.

What's the good of a Web site when you can't use it? (Silly question...you're forced to use the call centre and pay a fee of course).