Friend of mine is having the same issue with Delta flights. Called chase and they were of no help. Did you ever get this figured out/resolved?

Didnt see this issue when I booked a OW domestic ticket on Delta a month or 2 ago.

Just tried to book a one way ticket from LAX to CNS on Delta four times on line. Error message "Sorry we are unable to complete booking." I called CSR she tried received the same error. I gave different flights same error. She spoke to her supervisor who said there were no error in the system. The representative transferred me to another agent who received the same error. This agent left me on the phone for another forty minutes. I am going to call the Chase Sapphire Reserve CSR to see if there is anything they can do.

Chase UR Points, Huge point balance
 

As of next month I'll have just over 2,000,000 points on my reserve card. Is it foolish to keep the balance vs taking a cash payment? Is there any chance that Chase would cancel the card just to avoid paying out on the points?

No. Chase probably sees 2 million points as a $20,000 liability, which is trivial compared to the aggregate balance of $5.8 billion in unredeemed UR points.

In my personal opinion, it seems slightly foolish considering that saved points don't accrue interest. If you do plan on redeeming the points in the near future, it makes no difference. However if you don't plan on redeeming for several months, why not cash out, put it in a 2.2% APY online savings account, and accrue massive interest?

I guess the easy answer is that if I use the points for travel, I will get a 50% advantage vs cashing out the points (for cash).

This. Use what you can to book travel, save some for emergency travel and cash out the rest.

Chase ultimate reward points
 

I use the UR points most of time for travel. I have never had any problems booking on line before. It has been three days now and the site is still down and the agents on duty are unable to manually process booking.

When you try to book on expedia.com do you encounter the same or similar error?

I recommend holding and transferring to a partner program when you can get a desired award flight or award stay. Agree that earned points are a constantly devaluing asset and that they do not earn interest. But considering the markedly increased difficulty in obtaining points and miles, I submit that they are essentially an appreciating asset. The past few years have seen miles earned by flying, for most people, to be dramatically reduced. Almost every credit card issuer has instituted significant restrictions on churning accounts and/or bonuses. Most of the low hanging fruit of MS has been eliminated. I submit that the increased difficulty of earning miles and points surpasses their perceived and actual devaluation and absence of accruing interest.

The prices are the same as Expedia but you have to enter your credit card number to complete the booking. The agent at Expedia can issue tickets. UR is separate from Expedia and may not have proprietary rights. The agents can only take information to submit a trouble ticket. There is no estimate on how long the site will be down..

I booked a couple AS tix using Chase UR (never thought I'd do it) this afternoon with no issue.

Booking Flights on Ultimate Reward