Page compression may cause questions to appear in random order, and repeat [#1620082]

Hi all,

I had a 3.4 instance of quiz, which had this problem: I'd go to a quiz, which had, say 4 questions. For some users (not all), the quiz would start with question 2 (no message explaining why), then go question 4, then back to 2, then to 1, and so on, randomly.

I successfully upgraded to 4.4 according to the instructions on the home page of the quiz module, ran the upgrade script, cleared caches, but the exact same problem persists.

I'm assuming that my database is somehow corrupted, and would appreciate any help in solving this issue.

Thanks,

Albert

Comments

Comment #1

alberto56 CreditAttribution: alberto56 commented 7 June 2012 at 02:46

For user 1, I can take the quiz several times and it always works.
For some other users, the problem always occurs.
There are users I have used for testing, where it is possible that two people using the same account have been taking the quiz at the same time. Could this have corrupted the db?
For other users, I am certain that two people were not using the same account at the same time, yet the problem occurs, even the very first time this person takes the quiz after the upgrade.

is there any way I can tell quiz module to complety erase all information related to quizzes in progress? Might that help?

I am now going to put debugging trace code to understand exactly how the quiz_take_quiz() function determines which question to display.

Comment #2

alberto56 CreditAttribution: alberto56 commented 13 June 2012 at 13:24

Title:

Need help debugging a problem where my questions appear in random order, and repeat

» Page compression may cause questions to appear in random order, and repeat

Hmm, this is interesting. This seems to have solved the problem for me (for now?):

- go to a quiz and confirm the problem exists
- go to admin/settings/performance, disable page compression
- go to the same quiz, the problem no longer exists
- and this is the interesting part: go back to admin/settings/performace, and re-enable page compression, now it works.