problem with polyphony and appoggiatura

[liang seng]

To whom it may concern,
Hi, I have an interesting problem here. I've included the files "example.ly" 
and "example.pdf" file your reference.
On the 1st staff, the notes and the polyphony are what I intended to do.
Now, when I try to add an appoggiatura to the quarter note g, this is what 
happened as shown in the 2nd staff.
My questions are: 1. Why are the upper voice notes not aligned with the note 
on the lower voice when I add the appoggiatura ?
2. Why are the upper voice notes not beamed and their beam direction not 
heading up?
3. This is one perplexing. Why are the quarter notes on the 2nd bar of both 
staves not beamed together? Is this a bug?
Thank you.
Yours sincerely,

example.ly
Description: Text Data

example.pdf
Description: Adobe PDF document