Hello,
The date picker was working perfectly till a couple of months ago where the following issue started to occur:
Whenever editing a previously created page, the date cannot be selected and therefore cannot be edited:

Please note that typing // in that already saved page while in edit mode displays the following:

I checked and adding the date picker by typing // works as expected when creating a new page:
After saving that newly created page, the same issue occurs: upon editing it the date picker cannot be selected nor edited as seen below:
I tried using Chrome and Mozilla and this also happens to my colleagues.
We use Confluence 6.4.0.
Does anyone else has that issue or know how to fix it?
Thanks in advance!