HELP: Cannot delete task AFTER checking "Stop this page from being created" on popup window

I have never had a problem creating tasks for the past 4 years - however, just now it stopped working after I checked a box in the pop-up window.

What used to happen

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I clicked on the trashcan icon of a task and I used to get a pop-up which I routinely used to click on saying "OK" and delete worked perfectly

What I did today around 5:30am US Eastern

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Since I had a lot of tasks to delete, I checked the box that said "Prevent this page from being created" or something simliar.

What happened after that

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Since then, I have tried deleting tasks and while it took away the pop-up it seemed to have taken away my ability to delete tasks.

What is the best way to get the delete feature back - with or without the popup?

Thanks.

Sudip