According to http://bugs.kde.org/show_bug.cgi?id=118659 akregator crashes when moving or deleting feeds (happened to me 3 times). I rediffed against 3.5.0 and the patch is attached. I have installed this on my amd64 machine and it seems to work fine.
Created attachment 76706 [details, diff] akregator delete/move node crash fix
Shouldn't be a problem with 3.5.2, otherwise reopen please.