My login is not working after I migrating my hosting

Hi.
My website was working perfectly on my test live server, until I migrated hosting to another server. But customer login became buggy. It doesn't bring you to original page after you enter login name and pass. It stuck on below blank page.
/index.php?main_page=login&action=process

After 2-3 login tries then it let you in. What happened?

View logs folder and see errors.

gsmsalers:

Hi.
My website was working perfectly on my test live server, until I migrated hosting to another server. But customer login became buggy. It doesn't bring you to original page after you enter login name and pass. It stuck on below blank page.
/index.php?main_page=login&action=process

After 2-3 login tries then it let you in. What happened?

Have you got this working?
What zen cart version are you using?
A link to your site would be great.
Check both configure files and make sure all the information in them are correct. Most of the time when a person changes server the most likely problem is the 2 configure files are not set up right. Check your Session Directory make sure it is right.

cvhainb:

View logs folder and see errors.

My zencart version is 1.51 Here is log file. I edited hosting name to xxxxx for security reason. I don't know why it causes memory error in first line. About "query_factory.php" it's there, I don't know why it reports as "No such file or directory ". File exist right there.

[22-Nov-2013 02:47:57 UTC] PHP Fatal error: Allowed memory size of 67108864 bytes exhausted (tried to allocate 693694233 bytes) in xxxxxxxx/public_html/includes/functions/html_output.php on line 62
[22-Nov-2013 02:47:57 UTC] PHP Warning: require(includes/classes/db/mysql/query_factory.php): failed to open stream: No such file or directory in xxxxxxx/public_html/includes/functions/sessions.php on line 54
[22-Nov-2013 02:47:57 UTC] PHP Warning: require(includes/classes/db/mysql/query_factory.php): failed to open stream: No such file or directory in xxxxxxxxxx/public_html/includes/functions/sessions.php on line 54
[22-Nov-2013 02:47:57 UTC] PHP Fatal error: require(): Failed opening required 'includes/classes/db/mysql/query_factory.php' (include_path='.:/usr/lib/php:/usr/local/lib/php') in xxxxxxxxxx/public_html/includes/functions/sessions.php on line 54

gsmsalers:

My zencart version is 1.51 Here is log file. I edited hosting name to xxxxx for security reason. I don't know why it causes memory error in first line. About "query_factory.php" it's there, I don't know why it reports as "No such file or directory ". File exist right there.

[22-Nov-2013 02:47:57 UTC] PHP Fatal error: Allowed memory size of 67108864 bytes exhausted (tried to allocate 693694233 bytes) in xxxxxxxx/public_html/includes/functions/html_output.php on line 62
[22-Nov-2013 02:47:57 UTC] PHP Warning: require(includes/classes/db/mysql/query_factory.php): failed to open stream: No such file or directory in xxxxxxx/public_html/includes/functions/sessions.php on line 54
[22-Nov-2013 02:47:57 UTC] PHP Warning: require(includes/classes/db/mysql/query_factory.php): failed to open stream: No such file or directory in xxxxxxxxxx/public_html/includes/functions/sessions.php on line 54
[22-Nov-2013 02:47:57 UTC] PHP Fatal error: require(): Failed opening required 'includes/classes/db/mysql/query_factory.php' (include_path='.:/usr/lib/php:/usr/local/lib/php') in xxxxxxxxxx/public_html/includes/functions/sessions.php on line 54

Read this thread here to fix your problems.

http://www.zen-cart.com/showthread.php?207435-php-5-4-fatal-error-Allowed-memory-size-of-83886080-bytes-exhausted