I don't understand this condition :
!is_empty(Q2_SQ001_SQ004.NAOK) && (Q2_SQ001_SQ004.NAOK == Q2_SQ001_SQ004)

why not use !is_empty(Q2_SQ001_SQ004.NAOK) only ? (Q2_SQ001_SQ004.NAOK == Q2_SQ001_SQ004) must bet always true (since Q2 didn't have any condition or are filtered).

If i don't make logic error : you can surely fix by
Q2b: count(Q2_SQ001_SQ004.NAOK,Q2_SQ002_SQ004.NAOK,Q2_SQ003_SQ004.NAOK…)>0
Q2c: count(Q2_SQ001_SQ005.NAOK,Q2_SQ002_SQ005.NAOK,Q2_SQ003_SQ005.NAOK…)>0

There still a error in Expression (surely related to !is_empty(Q2_SQ001_SQ004.NAOK) && (Q2_SQ001_SQ004.NAOK == Q2_SQ001_SQ004) )

I deleted the code '&& (Q2_SQ001_SQ004.NAOK == Q2_SQ001_SQ004.NAOK)' etc for questions 2b, c & d, but the expressions are still not reloading after I duplicate the problem. New .lss is attached with the revised code.

No, confirmed is just confirmed. If i work on it : assigned.

If you are a limesurvey customer (support ticket), maybe on another way.

This is older. Good that it is reported now - needs to be solved in one of the upcoming releases

@cdorin : you lean : same issue in 2.73 ?

@DenisChenu, don't remember it in 2.73. Have been used this kind of expressions in survey mode for a while - spotted it once with the launch of LS 3

Work on last 2.X version …

OK,

Doing some tes : seems to happen ONLY for array number with checkbox layout …

Upload a more simple survey show the scpecific issue

https://github.com/LimeSurvey/LimeSurvey/commit/9106dfe8afb07b99f14814d3fbcf7550e2b44bb9

Great! Thanks for the fix.

Any way to know when the new version with this fix will be available? I need to figure out if I can wait for the new version before I activate my survey, or if I need to figure out a work around.

Sorry, bad mantis issue, this one really fixed now.

Quick fix (if have FTP access)
Replace
./application/views/survey/questions/answer/arrays/multiflexi/rows/cells/answer_td_checkboxes.twig
by
https://raw.githubusercontent.com/LimeSurvey/LimeSurvey/9106dfe8afb07b99f14814d3fbcf7550e2b44bb9/application/views/survey/questions/answer/arrays/multiflexi/rows/cells/answer_td_checkboxes.twig

Thanks for trying with the quick fix. I replaced the file, but I'm still running into the same issue. All my answers in Q2 are cleared out and Q2b, 2c and 2d disappear whenever any mandatory question on my survey is left blank and the submit button is clicked. I'll probably figure out a different way to set up this question, but wanted to report that it's still not working.

Maybe another difference between 3.15.1 and 3.15.5 because it work on my test with you survey.

Maybe : try to deactivate ajax mode on theme option

Capture d’écran du 2018-12-15 09-45-22.png (55,364 bytes)   

Capture d’écran du 2018-12-15 09-45-22.png (55,364 bytes)   

Really, it's working for you? I just updated to version 3.15.5 and deactivated ajax mode and I still can't get it to work.

Just so I know we are on the same page, let me ask you this....
Keep Q2 as is in your your screenshot above
Fill in 'AAA' for all three questions in Q2d
Hit Submit
After you do that and you scroll back up to Q2 & Q2d, do you still see all the responses you entered before you hit submit, including all the check marks in Q2 and the 'AAA' for each question in Q2d?

For some reason when I do it, all my check marks in Q2 are gone and I can't even see Q2d anymore, unless I check pyro-sequencing or send out again in Q2.

If you can still see all your answers, then I'm at a loss. I'll just rework the questions in my survey and see if I can get it to work after a future update.

I say it work with after this fix : https://github.com/LimeSurvey/LimeSurvey/commit/9106dfe8afb07b99f14814d3fbcf7550e2b44bb9

Then : have to wait 3.15.6 version