Unable to change due date on task

[dmorlitz]

When I attempt to update a due date on a task, the task fails to update on the Kanboard server with no error message on Kandroid. The Kandroid client also does not update the date on the display.

I am running Kanboard 1.0.45 on Debian Jessie. Kandroid is running on a Pixel XL with Android 7.1.2

To recreate this issue:

1. View a task
2. Select "Edit Task" from the triple-dot icon at the top left
3. Tap the "Due date" button right under task title and description
4. Pick any date other than the one currently selected
5. Press OK.
   (NOTE: The due-date button does update here to show the date that you just selected
6. Press the "Save" button at the top right

At this point, you see the refresh icon spinning and then are returned to the task - but the due date has not changed.

On my server's logs, I see 7 POST requests to the jsonrpc.php script - but 4 of them resulted in a 401 error. I am not sure how to capture the data that was actually submitted.

Here are the 7 access.log entries from my Apache server (IP address and username have been covered)
xxx.xxx.xxx.xxx - - [14/Aug/2017:10:24:09 -0400] "POST /kanboard/jsonrpc.php HTTP/1.1" 401 3567 "-" "Dalvik/2.1.0 (Linux; U; Android 7.1.2; Pixel XL Build/NHG47Q)"
xxx.xxx.xxx.xxx - - [14/Aug/2017:10:24:09 -0400] "POST /kanboard/jsonrpc.php HTTP/1.1" 401 3567 "-" "Dalvik/2.1.0 (Linux; U; Android 7.1.2; Pixel XL Build/NHG47Q)"
xxx.xxx.xxx.xxx - - [14/Aug/2017:10:24:09 -0400] "POST /kanboard/jsonrpc.php HTTP/1.1" 401 3567 "-" "Dalvik/2.1.0 (Linux; U; Android 7.1.2; Pixel XL Build/NHG47Q)"
xxx.xxx.xxx.xxx - - [14/Aug/2017:10:24:09 -0400] "POST /kanboard/jsonrpc.php HTTP/1.1" 401 3567 "-" "Dalvik/2.1.0 (Linux; U; Android 7.1.2; Pixel XL Build/NHG47Q)"
xxx.xxx.xxx.xxx - [14/Aug/2017:10:24:09 -0400] "POST /kanboard/jsonrpc.php HTTP/1.1" 200 486 "-" "Dalvik/2.1.0 (Linux; U; Android 7.1.2; Pixel XL Build/NHG47Q)"
xxx.xxx.xxx.xxx - [14/Aug/2017:10:24:09 -0400] "POST /kanboard/jsonrpc.php HTTP/1.1" 200 485 "-" "Dalvik/2.1.0 (Linux; U; Android 7.1.2; Pixel XL Build/NHG47Q)"
xxx.xxx.xxx.xxx - [14/Aug/2017:10:24:09 -0400] "POST /kanboard/jsonrpc.php HTTP/1.1" 200 1726 "-" "Dalvik/2.1.0 (Linux; U; Android 7.1.2;