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The install seemed to go fine, but with CiviCRM enabled, I get constant white screen of death. I have set max_execution_time and other variables sufficiently high that I doubt that's the source of the problem. I also get this warning error in my logs:

   Warning: call_user_func_array() [function.call-user-func-array]: First argument is expected to be a valid callback, 'civicrm_invoke' was given in menu_execute_active_handler() (line 503 of /home2/username/public_html/example/includes/menu.inc).

This is a relatively fresh install of Drupal 7.10, and disabling the module makes everything back to normal.

PHP 5.2.17
MySQL 5.1.60

The PHP logs from my host show:

[15-Dec-2011 13:40:18] PHP Fatal error: Allowed memory size of 67108864 bytes exhausted (tried to allocate 71 bytes) in /home2/username/public_html/example/includes/menu.inc on line 337 [15-Dec-2011 13:41:55]

(Can someone explain how an attempt to allocate 71 bytes can run through 67108864 bytes of memory?)
and

PHP Fatal error: Cannot redeclare _pear_call_destructors() (previously declared in /usr/lib/php/PEAR.php:773) in /home2/username/public_html/example/sites/all/modules/civicrm/packages/PEAR.php on line 811

(This latter error is repeated 19 times - for all the things I attempted - while the former appears only once, possibly on install.)

(Apologies for not posting those initially. Dreamhost (on which I manage another CiviCRM install) makes them difficult to get to. Bluehost, on the other hand, does not.)

Thanks - the explanation re: bytes makes sense, but with 90 MB available on the first try, and 128 MB for subsequent, I'm not sure how it's exhausting them all.

I'll see what I can find on the pear error. I now remember having to hunt for solutions to this before. Thanks, hopefully something will work.