Well neither of those issues point to our program there. Feel free to post a bid on an auction I placed here so you can get your server error thingy and then check your logs for any action around the time of your error.
test - Trading Card Plaza
You really need to track down your server related issue since this does not appear to be related to our code. One of the first things I do when someone reports an issue is go and try to duplicate it on my test site which always uses our latest default code.
Also try turning off your vb3 enhancedments under edit integration and see if the code operates fine without vb3 stuff.