Might be the same issue as MYAA-849
I see many of the following error messages:
2011-10-10 07:54:32,176 http-1443-16 ERROR mg3035 474x1970x2 1r3t79c 10.30.10.69 /rest/minyaaTime/1.0/worklog/gener ate [velocity] RHS of #set statement is null. Context will not be modified. templates/plugins/portlets/issuesummary fastworklog.vm [line 101, column 1]