A new reply had been posted to %s

Hi. This problem just appear 2 hours ago.

This is screenshot:

To explain, I config my profile to have notification when someone reply in topics I followed because my connection to gmail here is not stable enough to read email sometimes. There nothing wrong with it, till today, as you can see reply from Hamluis at 7 PM today still not have any problem, but from 8:30 pm there somthing wrong, If I click at %s, it will said : 400 bad request

Bad Request

Your browser sent a request that this server could not understand.

Anything I do wrong???

Thank you.

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