I report this bug at bugzilla.redhat, but i don't know if it happens to someone more.

"When I open a .7z file with ark, this doesn't show its content, just show a
normal ark windows, but empty. By other side, ark can uncompress a 7z file."

https://bugzilla.redhat.com/show_bug.cgi?id=620602

Check this one.......7-Zip 9.20

Clint

I Also had faced similar issue before few days.