eM client * prob;ems

I have been using eM client for some years however sionce the client 8 upgrade I am not able to view business emails - such as from my bank.
Private messages/emails are fine but commercial ones do not seem to down load. I am currently viewing these emails - without problems - on other devices but I want to get back to using eM client on my PC

Help!

Aren’t the unreadable “business messages” signed by digital certificate?
Can’t You see the warning “signature has some problems” or something like that in the mail header?