Custom Fields for Tasks just do not work

It seems the desktop app works better than the website. Thanks for the information, I seem to have it working now. I have another question for you. When you have an invoice with task line items, it automatically totals the cost amount which is good. Is there any way to make it also total up the hours? I played around with the configuration and didn’t see any way, but it seems like this is definitely something it should be able to do. I found this thread: Show the total hours spent on all tasks of the invoice but there doesn’t seem to be any resolution.