Marking Task complete doesn't work correctly

[renemo]

Hi,

I like the todo.txt-Format and I like the android app.
But:
When trying to Mark a task as complete in the app a screen appears with says:
"Marking task complete - please wait"
and it lasts forever.
When I kill the app or switch my "Galaxy S7" to stand-by an back on, then the task is closed.
I'm guessing that a refresh or the like is missing.

Could you fix this?
Regards Rene_