There seem to be issues with the (at least for some newly working) flash support in Konqueror.
Blauzahl mentioned she can use flash.
For (mutlu_inek) flash also works with minor crashes from time to time, it does automatically restart, though, so no problem. I am using self-compiled trunk, rev. 798847, and adobe's flashplugin 9.0.124 on Arch Linux.