blank page adding items to shopping cart or checking out

[bloomingvine]

I just tried to rename my template from classic to something else, and I must have screwed up something. I ended up having to restore my zencart store via my hosting's 24 hour ago back up. Evreything is back and working now, but when I go to place items in a shopping cart, it goes to a blank screen. I checked the cache file for the most recent mydebug log, and this is what it said..

[14-Apr-2011 05:14:01] PHP Warning: session_start() [<a href='function.session-start'>function.session-start</a>]: Cannot send session cache limiter - headers already sent (output started at /home/content/36/5920136/html/zencart/includes/classes/class.smtp.php:2135) in /home/content/36/5920136/html/zencart/includes/functions/sessions.php on line 114
[14-Apr-2011 05:14:01] PHP Warning: Cannot modify header information - headers already sent by (output started at /home/content/36/5920136/html/zencart/includes/classes/class.smtp.php:2135) in /home/content/36/5920136/html/zencart/myadmin/includes/init_includes/init_templates.php on line 28
[14-Apr-2011 05:14:01] PHP Warning: session_regenerate_id() [<a href='function.session-regenerate-id'>function.session-regenerate-id</a>]: Cannot regenerate session id - headers already sent in /home/content/36/5920136/html/zencart/includes/functions/sessions.php on line 179
[14-Apr-2011 05:14:01] PHP Warning: Cannot modify header information - headers already sent by (output started at /home/content/36/5920136/html/zencart/includes/classes/class.smtp.php:2135) in /home/content/36/5920136/html/zencart/myadmin/includes/functions/general.php on line 21

The items get placed in the shoping cart if you hit the back button, but initially goes to a blank page.

I have been reading and all I can find out is that somewhere , most likely, my restore caused a blank line or syntax error somewhere in the php. I dont know anything about php. If someone could please point me in the right direction? Or do I need to go through evry php file in the whole shop? I'm running zencart v. 1.3.9h and my site is at http://bloomingvinedesign.com/zencart/

[bloomingvine]

I also forgot, I know it was working earlier today because i ran a transaction through yesterday evening.

[haredo]

What version of zen cart are you using?
Is the error when you used Pay Pal?

[bloomingvine]

v 1.3.9h I can't put an item in my shopping cart. it goes to a blank page. nope. if you hit back, the item was put there. I dont want to mess things up even more since i am on the back up version. there is no restore from here.

[haredo]

I believe this is your problem..
Please read this thread..

https://www.zen-cart.com/tutorials/index.php?article=87

[bloomingvine]

ok I read that, and from that error report, found that the file had blank spaces. The problem is, I am not sure if im looking at the right error report or how to generate one. I fixed the spaces refered to on that particualr one, but I still get the blank page when putting items into my shopping cart.