Hi David, there is a bug that I would like to bring to your attention...
Scenario A:
1 - Start with fresh Cardo 1.0.3
2 - Create new task using right panel:

3 - Go to All Items, and the task is right there, under Next Tasks.
So far so good. However...
Scenario B:
1 - Start with fresh Cardo 1.0.3
2 - Go to All Items, and create task using the Next Tasks "+" button:

3 - Now the newly created task does not appear under Next Tasks!
A diff between the html files gives the following:
Scenario A: <div cardo-assignee="" cardo-category="(Unassigned)" cardo-guid="7d03ac35-8f94-4ae1-b769-936d38374a17" cardo-type="task" created="20170713122933630" icon="$:/plugins/Cardo/images/task" modified="20170713123022099" tags="Task Next" title="Buy a canary">
Scenario B: <div cardo-assignee="-SKIP-" cardo-category="" cardo-guid="a4e7e4e9-58a6-4e1e-b438-029dd17ab3f0" cardo-project="-SKIP-" cardo-type="task" created="20170713124410154" icon="$:/plugins/Cardo/images/task" modified="20170713124418223" tags="Task Next" title="Buy a canary">
It seems that the culprit is the cardo-category="" in scenario B. Indeed, if I change the task's Arena from empty to anything, even "(Unassigned)", the task suddenly appears in All Items.
Note that this is happening not only for tasks, but also for projects, reference items, etc. In addition, the other "+" buttons, such as the ones in the project tiddlers, have the same problem.
Thanks for this great tool!
Seba