Some charts have no response

I have open 4 chars for same symbol but diff time frame ,
but , after two days , some charts have no response ,
but no every char no response ,
i restart the Amibroker is same condition
how do i check the problem

What do you mean by no response ?

post some snaps atleast,
Give description of your Data vendor.
Share details of Amibroker version

Earlier you have some charts with problem, now all not working? is that what you mean?

See, I've typed more than you did !!!