The only errors I can see are with Singularity and the error below: [6:16:28 PM:43] System.Data.SQLite.SQLiteException: Some kind of disk I/O error occurred disk I/O error at System.Data.SQLite.SQLite3.Reset(SQLiteStatement stmt) at System.Data.SQLite.SQLite3.Step(SQLiteStatement stmt) at System.Data.SQLite.SQLiteDataReader.NextResult() at System.Data.SQLite.SQLiteDataReader..ctor(SQLiteCommand cmd, CommandBehavior behave) at System.Data.SQLite.SQLiteCommand.ExecuteReader(CommandBehavior behavior) at System.Data.SQLite.SQLiteCommand.ExecuteNonQuery() at System.Data.SQLite.SQLiteTransaction.Commit() at ..() I can't see any error message for Instancebuddy.
I've just tested IB with 2 characters (2 x instances) and it is accepting dungeon invites - IB is giving another error but that is unrelated to your issue.