Hi Gavin

Thanks for the input. Below are 2 error messages and some MySQL query output (I have changed the user_id fields due to our privacy laws).

The error messages below were obtained by user1, user2 did not get any error messages today, although he did yesterday. All of the sample data below was gathered from a freshly created gateway quiz using the same problem groups as previous tests with the same errors. Note on v1 of the test user1 got a null version_creation_time in the database. Similarly, the errors are on lines that reference the version_creation_time variable.

Tom

WeBWorK Warnings

WeBWorK has encountered warnings while processing your request. If

this occured when viewing a problem, it was likely caused by an error

or ambiguity in that problem. Otherwise, it may indicate a problem

with the WeBWorK system itself. If you are a student, report these

warnings to your professor to have them corrected. If you are a

professor, please consult the warning output below for more information.

Warning messages

* Argument "" isn't numeric in numeric gt (>) at

/usr/local/webwork/webwork2/lib/WeBWorK/ContentGenerator/GatewayQuiz.pm line

644.

Request information

Time Tue Jun 23 13:29:02 2009

Method GET

URI /webwork2/MathSkills/quiz_mode/Math_Skills_Test_04/

WeBWorK Warnings

WeBWorK has encountered warnings while processing your request. If

this occured when viewing a problem, it was likely caused by an error

or ambiguity in that problem. Otherwise, it may indicate a problem

with the WeBWorK system itself. If you are a student, report these

warnings to your professor to have them corrected. If you are a

professor, please consult the warning output below for more information.

Warning messages

* Argument "" isn't numeric in localtime at

/usr/local/webwork/webwork2/lib/WeBWorK/ContentGenerator/ProblemSets.pm line

469.

Request information

Time Tue Jun 23 13:35:39 2009

Method GET

URI /webwork2/MathSkills/

select set_id, user_id, open_date, due_date, published, time_interval, version_time_limit, version_creation_time from MathSkills_set_user where set_id like '%Test_04%' order by set_id, user_id;

| Math_Skills_Test_04,v1 | user1 | 1244552700 | 1529154300 | 1 | 60 | 1800 | NULL |

| Math_Skills_Test_04,v1 | user2 | 1245768927 | 1245770727 | 1 | 60 | 1800 | 1245768927 |

| Math_Skills_Test_04,v2 | user1 | 1245778139 | 1245779939 | 1 | 60 | 1800 | 1245778139 |

| Math_Skills_Test_04,v3 | user1 | 1245778431 | 1245780231 | 1 | 60 | 1800 | 1245778431 |

+------------------------+------------+------------+------------+-----------+---------------+--------------------+-----------------------+

select user_id, set_id, problem_id, source_file from MathSkills_problem_user where set_id like '%Test_04%';

| user1 | Math_Skills_Test_04,v1 | 1 | Library/Rochester/setAlgebra28ExpFunctions/srw4_1_1.pg |

| user1 | Math_Skills_Test_04,v1 | 2 | Library/ASU-topics/setExponentialFunctions/srw4_1_29.pg |

| user1 | Math_Skills_Test_04,v1 | 3 | Library/Rochester/setAlgebra28ExpFunctions/srw4_1_33.pg |

| user1 | Math_Skills_Test_04,v1 | 4 | Library/Rochester/setAlgebra31LogExpApplications/decay2.pg |

| user1 | Math_Skills_Test_04,v1 | 5 | Library/ASU-topics/setLogarithmicFunctions/beth1.pg |

| user1 | Math_Skills_Test_04,v1 | 6 | Library/ASU-topics/setLogarithmicFunctions/srw4_3_41-42.pg |

| user1 | Math_Skills_Test_04,v1 | 7 | Library/Rochester/setAlgebra29LogFunctions/beth1logfun.pg |

| user1 | Math_Skills_Test_04,v1 | 8 | Library/ASU-topics/setLogarithmicFunctions/jj1.pg |

| user1 | Math_Skills_Test_04,v1 | 9 | Library/Rochester/setAlgebra30LogExpEqns/srw4_2_23.pg |

| user2 | Math_Skills_Test_04,v1 | 1 | Library/ASU-topics/setExponentialFunctions/srw4_1_3.pg |

| user2 | Math_Skills_Test_04,v1 | 2 | Library/ASU-topics/setExponentialFunctions/srw4_1_31.pg |

| user2 | Math_Skills_Test_04,v1 | 3 | Library/Rochester/setAlgebra28ExpFunctions/srw4_1_9.pg |

| user2 | Math_Skills_Test_04,v1 | 4 | Library/Rochester/setAlgebra31LogExpApplications/srw4_5_21.pg |

| user2 | Math_Skills_Test_04,v1 | 5 | Library/Rochester/setAlgebra29LogFunctions/problem1.pg |

| user2 | Math_Skills_Test_04,v1 | 6 | Library/ASU-topics/setLogarithmicFunctions/beth3logfun.pg |

| user2 | Math_Skills_Test_04,v1 | 7 | Library/ASU-topics/setLogarithmicFunctions/jj2.pg |

| user2 | Math_Skills_Test_04,v1 | 8 | Library/ASU-topics/setLogarithmicFunctions/srw4_5_10.pg |

| user2 | Math_Skills_Test_04,v1 | 9 | Library/Rochester/setAlgebra30LogExpEqns/srw4_4_72.pg |

| user2 | Math_Skills_Test_04,v1 | 10 | Library/Rochester/setAlgebra30LogExpEqns/problem15.pg |

| user1 | Math_Skills_Test_04,v2 | 1 | Library/Michigan/Chap1Sec2/Q38.pg |

| user1 | Math_Skills_Test_04,v2 | 2 | Library/Rochester/setAlgebra28ExpFunctions/ur_le_1_5.pg |

| user1 | Math_Skills_Test_04,v2 | 3 | Library/Michigan/Chap1Sec2/Q20.pg |

| user1 | Math_Skills_Test_04,v2 | 4 | Library/ASU-topics/setExponentialFunctions/sw6_2_13.pg |

| user1 | Math_Skills_Test_04,v2 | 5 | Library/Rochester/setAlgebra29LogFunctions/sw6_3_13.pg |

| user1 | Math_Skills_Test_04,v2 | 6 | Library/Rochester/setAlgebra29LogFunctions/sw6_3_3.pg |

| user1 | Math_Skills_Test_04,v2 | 7 | Library/Rochester/setAlgebra29LogFunctions/srw4_2_59.pg |

| user1 | Math_Skills_Test_04,v2 | 8 | Library/ASU-topics/setLogarithmicFunctions/srw4_5_10.pg |

| user1 | Math_Skills_Test_04,v2 | 9 | Library/Rochester/setAlgebra30LogExpEqns/problem4.pg |

| user1 | Math_Skills_Test_04,v2 | 10 | Library/Rochester/setAlgebra30LogExpEqns/problem8.pg |

| user1 | Math_Skills_Test_04,v3 | 1 | Library/Michigan/Chap1Sec4/Q39.pg |

| user1 | Math_Skills_Test_04,v3 | 2 | Library/Rochester/setAlgebra28ExpFunctions/ur_log_1_3.pg |

| user1 | Math_Skills_Test_04,v3 | 3 | Library/Rochester/setAlgebra28ExpFunctions/srw4_1_11.pg |

| user1 | Math_Skills_Test_04,v3 | 4 | Library/Michigan/Chap1Sec4/Q36.pg |

| user1 | Math_Skills_Test_04,v3 | 5 | Library/Rochester/setAlgebra29LogFunctions/srw4_3_49.pg |

| user1 | Math_Skills_Test_04,v3 | 6 | Library/Rochester/setAlgebra29LogFunctions/sw6_3_3.pg |

| user1 | Math_Skills_Test_04,v3 | 7 | Library/Rochester/setAlgebra29LogFunctions/srw4_2_59.pg |

| user1 | Math_Skills_Test_04,v3 | 8 | Library/ASU-topics/setLogarithmicFunctions/srw4_5_1.pg |

| user1 | Math_Skills_Test_04,v3 | 9 | Library/Rochester/setAlgebra30LogExpEqns/srw4_4_72.pg |

| user1 | Math_Skills_Test_04,v3 | 10 | Library/Rochester/setAlgebra30LogExpEqns/srw4_2_37.pg |