Jenny G reports she tried buying a CharlieCard at Davis Square with her credit card on Friday. Just wouldn't take. Finally, one of those roving T "ambassadors" told her the machines weren't accepting credit cards - so she used the last of the change in her purse to buy one. Surprise:

... Today I checked my credit card on line & see that I have been charged $10 for the Charlie card I didn't receive. I guess the system was working well enough to charge credit cards, just not well enough to provide Charlie cards for the charged amount. ...