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 requestBad Request
Your browser sent a request that this server could not understand.
Anything I do wrong???