Hello All

I am trying to have a website developed, its rather large. A number of unrelated developers are recently working on it. Some, from new, can log on and compile the code immediately, others can not, try what what may they keep running into problems, sometimes theres headway. The lead programmer has spent hours on it and remains clueless.
Is there any principles, tips or tactics that can be tried, for now we're trying to "perform code setup again from scratch". The latest software, patches and so on are in place.
What about different computers, or what is it that allows for some to experience no problems and others to have endless problems - what does it mean.

Any help appreciated