no new WU from SETI,ROSETTA,EINSTEIN

I run SETI, ROSETTA,EINSTEIN and I have processed several WU for SETI and ROSETTA and only one for EINSTEIN. But from some days I can't fetch new work from the projects ( the first was Einstein) and I receive these messages from server: not requesting new work and today "you don't have enough.... no disk space, you must free 243,9 MB .But I've not change anything in my computer or in general preferences:
use no more 1 GB disk space
leave at least 1 GB " "
use no more 70% disk space
use no more 60% total virtual memory
Help !
Thank you
Diego from Italy
I Mac G3 OS X Tiger 10,4