paging module not working exactly what i expect

Hi dear

Its very nice to use the paging for article content,

I use this paging,

But am facing the problem,

Let i explain,

i am doing upgradation project,around 20000 articles in my db,

so for paginatination purpose, i added the pagebreak for the 20000 article , through some php function lke chunk split,

now i added break to all my articles,

when i enable the paging,

the pagination not working, but when i directly edit the aricle in table , its working,

any idea for this situation..