Cannot see my folders nor images.

I had no problem in this respect before!
Why now?
Why do not I get any reply?

OS Windows 7 Home Premium Dutch
ThunderbirdPortable 2.0.0.23.

All of a sudden I cannot get my mailboxes on screen anymore.
At start up I only get the screen about a.o accounts and advanced features.

At the same time I cannot get images in my mail, nor see the option whether I want to show them or not.

I hope you do understand what I mean.

I am axious to read the solution.