Henry,
I have raised support ticket 3591/2014 but no joy as yet. They suggested adjusting the xmx setting on the ini file (mentioned above) but I had already done that and they haven't gotten back to me since. I'll PM you a copy of the data file if you want to see if you can replicate.
Doing other research seems to indicate R a-priori is a bit of a memory hog generally but if you can't run it on what I consider to be a pretty small dataset it's going to severely limit what we can do with PA.
Regards,
Glenn