i'm going through the same thing, it was about 8-10 cents lower now it's more like 20-23 cents lower.  The reason for the big difference in win loss today was probably because the us market wasn't open yesterday so that hadn't been figured in.  It has seemed to follow it either way, never losing when not is winning or vice-versa, so it seems hard to believe that it could happen that way (not go up 5 dollars and nosof go down one) although i'm definitely no expert on this