If a payment for an anonymous order does not go through the first time for whatever reason (invalid card number, payment gateway timeout, etc.) subsequent attempts to submit a payment for that order will fail with the error:
Value cannot be null. Parameter name: request.Payment.Order.User
This is due to a bug in AbleCommerce that causes the user ID associated with the order to be removed. This is the correct action for anonymous orders that have been completed, but in this case order processing is not yet complete.
To work around the issue you have to dive into the database and add the anonymous user’s ID back to the order record. After this step has been done the next attempt to process a payment should proceed normally. This has to be done after each payment failure.
TypeError: M.core_formchangechecker is undefined
To work around the issue I have disabled caching. This isn’t ideal, but until a solution is found it is the most workable option.
Float styling is a useful aspect of CSS … until it’s not. When a floated element occurs inside a container and you want it to be wholly in that container you have to resort to hacks to do so. Or do you? Never content to assume that a question has been resolved, I decided to see if anyone had come up with a new method of clearing a float. Lo and behold a solution has emerged, and the solution is so simple as to defy logic: apply
overflow: auto to the container element. I’ll leave the full explanation (with examples, alternatives, and warnings) to the experts.
Of course, there can be advantages to the default float rendering. Most notably I found it useful for creating some nice formatting around blockquotes, such as in our textbook analysis report.