If you cancelled them manually, then you will find their names in the message window of the BOINC manager which you could paste in here.
I understand. Since my last posting some weeks ago, the WUs are mainly around 1.5 hrs in size with only few exceptions and as I believe these can easily be handled even without checkpointing. More importantly, they do not consume these tremendous amounts of RAM as some earlier batches did.
So far, checkpointing is there only for x86 Linux as before. As soon as this changes, we will of course announce it.
Michael.