My Avast Mac Security, 13.11, "Cannot be opened because of a problem." Apple's report identifies the termination cause as "DYLD, [0x1] Library missing." Apple support says this is the key information, but further detail is available:
Dyld Error Message:
Library not loaded: @rpath/libprotobuf-lite.8.dylib
Referenced from: /Applications/Avast/Avast.app/Contents/MacOS/Avast
Reason: image not found