Same here, opening and saving files via Transmit does beep and throw an error but it is working.
Okay -- I can reproduce this myself. I can't really figure out what the problem is, other than the reply I get from Transmit contains the error code (which I log).
I'll remove the beep for 1.1b13 and write Panic to ask if they have an idea.
As for the exceptions, that's more likely to be my fault, but I can't reproduce these. This is only when opening/closing files via Transmit?
Could those of you who get the “index out of bounds” exceptions please test another FTP program to see if it gives the same behavior?