layout post-simulation problem

[lhlbluesky]

i use calibre PEX for layout post-simulation, but relative to the pre-simulation results, post-simulation results diff very much; in some cases, it even can't work.
why? what is the reason? and how to find the problem in layout, and fix them one by one? how to find the relating net or location in layout?

i have not any experience about this, pls help me, and give me some advice.
thanks.

 

[Raju C]

go for the project in which you are doing and go for the tools option and check, their will be some net list .

 

[lhlbluesky]

can you speak more clearly, pls? thanks.