允许预编译的Visual Studio Web页面可更新的区别是什么？

I've built a web site several times using the default "allow this precompiled site to be updatable" however on the most recent compile the website was very broken. After playing around with the .dll's (deleting and replacing them, in the bin) I noticed certain parts of the website starting to work again, but if I put all of the original .dll's in the site was broken.I've built a web site several times using the d