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Was there any error that happen when you tried modifying the Checklist option?
Can you provide us more details. Which of the Checklist in the form is having the issue?
I tried it on your jotform http://www.jotformpro.com/form/50542645203952 but I could not reproduce any issue. I was able to add more option on the checklist.
Please see the screen below when I test it.
Let us know if issue persist.
Here is a screenshot of what I see on all the checklist in this form...
Here is what I have.
Check with Titus maybe he can help us to solve this problem
This happen to me also with another widget when you update it..
Thank you for providing us with more details and screenshot.
So far I could not replicate the problem on my end. But obviously it happens for you.
I will elevate this thread to our higher team support so that it can be immediately check.
We will notify you here for any update on the status.
I'm sorry about the inconvenience this caused you.
This happened when we changed data centers for operational reasons - and your widgets were loaded from an older version.
I have refreshed all your widgets to access the current version - so you should be able to access all settings again - please check.
Let us know how we can help further -