Anyone?

I had a look at the guest book, and it gives a blank page on submission as you mentioned.

I am no expert to give you an instant solution, but I would suggest couple trouble shooting steps to begin with that could help you narrow down the cause of the proble. Go to the site dashboard > Sitewide settings > Debug set Debug level to Development also please confirm if in the Logging option, Log Application Exceptions and Log Email sent are set to on.

Next you could once more try doing a submit on the guestbook and see if you get any errors instead of the blank page, if any you could post it here, also you could visit dashboard > Reports > Logs and see what errors are showing up and post it here.

Thanks for your help Pritam.

I did what you told me to do, but no error or any log information is showed. Still the blanc page.

Could it be a file permission issue ?

I hope you had set the proper file permissions after you migrated to a new host. You have to set

Chmod 777 on /config
Chmod 777 on /files (recursive to all files and sub-dir's)
Chmod 777 /packages

If you already done this then it could be some other reason. Are you sure the Logs file is not showing any messages.

I did set the correct chmod settings on the folders you called.
But i was not sure If there where other folders besides those 3

So this is not the problem.

I'm 100% sure there is no debug or log information showed.
It did when it was on my old domain.

Is there a way to reinstall the guestbook and keep the posted messages?

I would suggest you to back up these two tables using phpmyadmin, the second one I believe is more important to reinstalling the guest book block

btguestbook
btguestbookentries

Ok, I found out that the problem is not Guestbook related but Email related.
When I click on reset and Email password the same problem occur get the same white page.

Any idea?