We recently installed a trial of LSLB.
Now google is reporting "Increase in server errors" trough google webmaster tools.
The errors seem to have started the same day we installed LSLB and it's mostly error 500. Some 503 errors too.
Google webmaster tools has a clear increase in 500/503 errors. Before LSLB was instaleld it was nearly '0' errors all the time.
Now with LSLB installed it's at 500 - 700 a day.