another report for [rand~], by the way, maybe you should get involved here and mark them as fixed 

http://sourceforge.net/p/pure-data/bugs/1177/

2015-06-09 10:12 GMT-03:00 Alexandre Torres Porres <porres@gmail.com>:

About the sample-offset, I have some problem understanding how it works,
and have to change it anyhow to fix the issue (garray_getarraywords
related on 64-bit systems).

seems there was a bug report about this :) 

http://sourceforge.net/p/pure-data/bugs/1180/