lti 2.1 fixes
lti 2.1 fixes

vitalsource/LTI2,haszari/LTI2-Reference,haszari/LTI2-Reference,vitalsource/LTI2-Reference,haszari/LTI2-Reference,vitalsource/LTI2-Reference,rradonic/LTI2-Reference,vitalsource/LTI2,vitalsource/LTI2,vitalsource/LTI2-Reference,rradonic/LTI2-Reference,rradonic/LTI2-Reference