Cannot update Campaign Form

I created a campaign form and it once successfully worked.



Then I tried to update this form.



After I finished amendment and click “save & close”,

this transaction will never finished so I cannot update this form.



Is there somebody has same experience or know why this happen?

I created a campaign form and it once successfully worked.

Then I tried to update this form.

After I finished amendment and click “save & close”,
this transaction will never finished so I cannot update this form.

Is there somebody has same experience or know why this happen?