I just started using Todoist. When switching between projects, sometimes when I come back to one project in particular, tasks I have previously entered disappear. The label, due date, and recurring icon still appear, but the actual text of the task is blank. I can send you a screen shot if it helps. It has happened on multiple tasks within that same project, requiring that I re-enter the task.
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If this won't help, try to disable all plugins you use in your browser and see if it solves the issue. If not, you can send a screenshot to email@example.com