You really need your host to respond here as they are the only ones who can read the error log and say what the problem here with the server is.
I have shown you explicitly that the program works. You did test on my test site right?
There is no difference in the code this is what I am telling you. Every last bid that is entered into the system runs an insert into the bids table. Its really that simple. There are a couple checks saying if the bid is too low say so. But other than that there is no difference. The file itself is very small and simplistic compared to most of the program.
Feel free to send me server info through the contact link if you want but there is very little I can do about a server error like that without knowing from your host what the issue is.