scrypt: Decrypting file would require too much memory

[Christoph Borsbach <christoph+tarsnap@borsbach.org>]

Hello Colin and everyone,
I have a simple question regarding the scrypt utility. I use it to encrypt
and decrypt a small textfile, which changes from time to time. Since the last
change I made to the file I get the following error when I try to "dec" the
file: 

scrypt: Decrypting file would require too much memory

I tried to play around with the -m and -M options, but no matter how much
memory I grant scrypt, the error persists. This is scrypt-1.1.6 on an OpenBSD
5.7 system. Now, the same file decrypts fine on an Ubuntu Linux System with
scrypt 1.1.6., so I can get to the data, no problem. The file is very small,
just a 100 lines of test, if that. 

I'm curious what's going on, if I'm doing something wrong and in what
direction I should start looking. 

Thank you very much for tarsnap and scrpyt! 

Christoph