Since upgrading to moodle 2.3.4+, I've had quite a few PHP errors. The most prominent is teachers getting locked out of their courses. Along with people not being able to upload or delete things in their courses. Also, doing a restore of a course is failing. (Sorry if this is too much for this post but I didn't know how to separate all this) This teacher was just posting information to her course when she received the error:

"Coding error detected, it must be fixed by a programmer: PHP catchable fatal error"

Environment:
Moodle 2.3.4+ (Build 20130125)
PHP 5.3.13
MSSQL 2008 R2
FreeTDS

Here's everything that I can find in the PHP error logs:

PHP Notice: Undefined property: stdClass::$teamsubmission in C:\inetpub\wwwroot\mod\assign\submission\comments\lib.php on line 98
PHP Notice: Undefined property: stdClass::$teamsubmission in C:\inetpub\wwwroot\mod\assign\submission\comments\lib.php on line 54

PHP Fatal error: Maximum execution time of 300 seconds exceeded in C:\inetpub\wwwroot\lib\filestorage\stored_file.php on line 371

Default exception handler: Error reading from database Debug: The data types ntext and nvarchar are incompatible in the equal to operator.
SELECT repositoryid, id FROM mdl_files_reference
WHERE referencehash = ? and reference = ?
[array (
0 => '790a78b7f31118a07d7ddcd331783517691d8462',
1 => 'YTo2OntzOjk6ImNvbnRleHRpZCI7aToyOTA5NjtzOjk6ImNvbXBvbmVudCI7czo2OiJjb3Vyc2UiO3M6NjoiaXRlbWlkIjtpOjY4NjM7czo4OiJmaWxlYXJlYSI7czo3OiJzZWN0aW9uIjtzOjg6ImZpbGVwYXRoIjtzOjE6Ii8iO3M6ODoiZmlsZW5hbWUiO3M6MTA6ImxpYjEzNS5wbmciO30=',
)]
Error code: dmlreadexception

• line 407 of \lib\dml\moodle_database.php: dml_read_exception thrown
• line 256 of \lib\dml\mssql_native_moodle_database.php: call to moodle_database->query_end()
• line 713 of \lib\dml\mssql_native_moodle_database.php: call to mssql_native_moodle_database->query_end()
• line 1837 of \lib\filestorage\file_storage.php: call to mssql_native_moodle_database->get_recordset_sql()
• line 835 of \lib\filelib.php: call to file_storage->update_references_to_storedfile()
• line 222 of \lib\filelib.php: call to file_save_draft_area_files()
• line 75 of \course\editsection.php: call to file_postupdate_standard_editor()

Default exception handler: error/Ajax rest.php: Could not delete the resource Yi-Jie, Tang (1991). "The Origin and Characteristics of Daoism (Taoism)," in Confucianism, Buddhism, Daoism, Christianity and Chinese Culture (Cultural Heritage and Contemporary Life, Series III: Asia, Volume 3), Chapter VII. from section Debug:
Error code: Ajax rest.php: Could not delete the resource Yi-Jie, Tang (1991). "The Origin and Characteristics of Daoism (Taoism)," in Confucianism, Buddhism, Daoism, Christianity and Chinese Culture (Cultural Heritage and Contemporary Life, Series III: Asia, Volume 3), Chapter VII. from section
$a contents:

• line 226 of \course\rest.php: moodle_exception thrown

[31-Jan-2013 04:35:31 UTC] Default exception handler: Can not find data record in database table course_modules. Debug: SELECT id,course FROM

{course_modules} WHERE id = ?
[array (
0 => '29128',
)]
Error code: invalidrecord
* line 1335 of \lib\dml\moodle_database.php: dml_missing_record_exception thrown
* line 1311 of \lib\dml\moodle_database.php: call to moodle_database->get_record_select()
* line 6649 of \lib\accesslib.php: call to moodle_database->get_record()
* line 1485 of \course\lib.php: call to context_module::instance()
* line 720 of \course\format\renderer.php: call to print_section()
* line 52 of \course\format\topics\format.php: call to format_section_renderer_base->print_multiple_section_page()
* line 281 of \course\view.php: call to require()

[31-Jan-2013 04:35:37 UTC] Default exception handler: Can not find data record in database table course_modules. Debug: SELECT id,course FROM {course_modules}

WHERE id = ?
[array (
0 => '29128',
)]
Error code: invalidrecord

• line 1335 of \lib\dml\moodle_database.php: dml_missing_record_exception thrown
• line 1311 of \lib\dml\moodle_database.php: call to moodle_database->get_record_select()
• line 6649 of \lib\accesslib.php: call to moodle_database->get_record()
• line 1485 of \course\lib.php: call to context_module::instance()
• line 720 of \course\format\renderer.php: call to print_section()
• line 52 of \course\format\topics\format.php: call to format_section_renderer_base->print_multiple_section_page()
• line 281 of \course\view.php: call to require()

[31-Jan-2013 04:38:28 UTC]
[31-Jan-2013 04:45:40 UTC] Default exception handler: A required parameter (id) was missing Debug:
Error code: missingparam

• line 467 of \lib\setuplib.php: moodle_exception thrown
• line 516 of \lib\moodlelib.php: call to print_error()
• line 30 of \mod\assign\view.php: call to required_param()

Default exception handler: error/nocourseid Debug:
Error code: nocourseid
$a contents:

• line 467 of \lib\setuplib.php: moodle_exception thrown
• line 37 of \grade\report\user\index.php: call to print_error()

There's many others....I'll just upload my full PHP log