images not displayed in em client

lately em client does not display any images in my mail, just a blank square with a red cross.
How to fix?

Can you please send us (staron@emclient.com) one of the problematic emails where the problem occurs?
Don’t you use some kind of firewall/antivirus or protection that can prevent displaying images?
Also be sure that your settings in menu Tools->Settings->Read->Unsafe Content is set correctly.