So I am hoping someone can help, I am new to using D&D Beyond for my adventures and I have discovered an issue.  I create my adventure with no problem, my characters joined but the one character that was a pre-generated character cannot see the source books, where as the premade character can.  I have sharing turned on but this dosen't make since as to why one can see them but the other cannot.  Can someone help me with this? 

The one who cannot should check that their Account Entitlements are in sync: (https://www.dndbeyond.com/account/marketplace). After that you could try turning content sharing off and back on again.