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Zen Cart 1.5.6c
EO 4.5.3, so the same

Here's an odd one. A client has been using Edit Orders for a few years. We recently upgraded the site to Zen Cart 1.5.7a and EO 4.5.3.

They used to be able to enter a negative number for product...

Talk with your hosting company about this.

FWIW, I don't recall any integration between Dual Pricing and Edit Orders. I have used DP many times, but EO only rarely but in my usage and maintaining of DP was never aware of any. Just my $0.02

If you kept a backup before you upgraded, sure ... and if you don't mind losing any database records added since that backup, too.

Checking your server logs or contacting your host to find the reason for the 500 error will be helpful in tracking down the cause.

Using Zen Cart 1.5.1. Installed EO 4.1.2

When editing an order, then selecting add a new product if the product has drop-down attributes, it displays only the first option...no drop-down. ...