Other Car Rental Programs/Partners (ie. Alamo, Enterprise, Sixt) - alamo website problems

For the last two days, every time I try to make a reservation on the website, I get
"Your reservation request has expired. Please re-enter your request in the fields below."

I wonder how pervasive this is?

I had this same problem awhile back when I was trying to access www.goalamo.com. (http://www.goalamo.com.) Instead, I went to www.alamo.com (http://www.alamo.com) and it worked fine.