Error Log -- What's causing this?

[heinscott]

Hello...
Recently, I have launched our Able site, and unfortunately, it looks like our conversion rates have dropped quite a bit. Certain customers have called and claimed that they have had problems checking out, with a blank receipt page showing after entering credit card info. Not sure how often this happens... perhaps most don't even call...
One thing I can say, though, is that the order is not being recorded in the admin side.
Has anyone else experienced this problem?
I have a couple of errors that have been showing up in my error log, that maybe could shed some light on this problem.
The first one is:

9/24/2008 9:48:07 PM Error Unhandled exception during checkout. String or binary data would be truncated.
The statement has been terminated.

The second one is:

9/22/2008 1:35:56 PM Error Unhandled exception during checkout. Cannot insert the value NULL into column 'TotalCharges', table 'AbleCommerce.dbo.ac_Orders'; column does not allow nulls. UPDATE fails.
The statement has been terminated.

Thanks for any help on this.

Scott

[jmestep]

Have you customized your checkout pages? I haven't heard of this error with several sites I have for clients.