Is the weld-all-around symbol acceptable when a fillet weld must be continued out-of-plane?
No. Use of the weld-all-around symbol at conditions that would require the weld to be continued out-of-plane calls for a condition that is specifically prohibited in the 2005 AISC Specification Section J2.2b and AWS D1.1:2004 Section 2.8.3.5. Instead, when an out-of-plane transition occurs, the welds must be interrupted at the corner common to both welds.