Menu bug? And other menu challenges

Hi, I'm making new web site with the Catch Responsive theme and I found interesting problem from it. 1) Secondary menu is not working as it should. When clicking links in the secondary menu, the browser opens the pages in new tabs. One click, one new tab. That is not how it should be. I have not put that possible in the menu options. Last time I was doing the menus, before I had 1-2 months break, it worked as it should have. Primary menu seems to work as it should. The pages opens in the same window. A bug? How to fix? 2) I have very many pages in my web site and they need to be organized well. It seems that time to time the whole menu editing tool stops working on wrong time. I've got few times an error when I've had a huge secondary menu tree and when saving the menu settings, there comes just huge error list on my admin panel. Basically the whole menu is gone. As far as I can see, there is no way of returning the lost job at that point. The problem have occurred only while saving the menu. 3) Is it possible to have an arrow or another clear sign to the menus which shows sub menus? It would make the menu usage much easier if able to see where is sub menus and where is not sub menus.