Why can I no longer delete any "watched items" has been happening for a couple of weeks now!

[turrethead]

Why can I no longer delete any "watched items" has been happening for a couple of weeks now and the list of outdated items on my watch list is getting out of control.

When opened in a new tab the url "about:blank#blocked" is displayed but stilll I cannot delete any items.

Advice please?

[robboscoke]

all working well on my eBay.

clear all cookies, history and cached data.
Then turn off power for the computer and router and NBN equipment at the wall again.
After 5 minutes reboot. Then log on. Do not use Internet explorer switch to Microsoft EDGE that comes with Windows 10.