When sending messages via the Windows 10 app most of the times I get a NullReference exception. It seems that the message gets sent (as I get responses), but it is not shown in the app UI. It is not shown in the phone messaging app as well. Here is the log: Arg_NullReferenceException at Join.GCMListener.<>c__DisplayClass22_1.<FireEvent>b__0() at Join!<BaseAddress>+0x9b2235 at Join!<BaseAddress>+0x9b21dc --- End of stack trace from previous location where exception was thrown --- at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() at SharedLibrary!<BaseAddress>+0x4d5c60 at SharedLibrary!<BaseAddress>+0x4d5be8 at SharedLibrary!<BaseAddress>+0x4d5ba7 at SharedLibrary!<BaseAddress>+0x54529b at Join!<BaseAddress>+0x949159
piggy backing on this -- I bought the Join app about 2 years ago via google play for a little over $5 -- was curious, do I have to buy the Windows 10 app on top of this? just curious.