Hi Renaud,
Yes, new release (2.3.4c) works. Thanks a lot!
(And yes, it only happened when not using the inactivity option - which not many people will do because that is the most important feature of the program).
Here is my /proc/diskstats (DS112, DSM4.1-2636):
1 0 ram0 0 0 0 0 0 0...