I am have huge problems with latest DWeaver - in fact do not like it

I am totally fed up with the latest version of dweaver. Used to use very old version and always good. Now, neverending problems!

Have uninstalled and reinstalled and still problems.   Working on one site, then view my saved page in local browser, ok it is fine. Then in Dweaver I opened up a different site had made, and was editing that, then when saved page and go to view that page in browser, it kept going and showing the page I had seen before from different site!!!   Will not allow me to view other page from other site working on.   have closed opened and still the same, does not allow to view different sites designed as keeps reverting to the one had open originally!!!!

Also..... when viewing a saved page on local browser the window url always used to show what it was, now only says the page is .. / index - this is not true as some are profile, some are gallery and other diff title pages, but all show when viewed as / index.

My list goes on and one with problems.... Another one is that I go to copy the html of a page as wish to paste into new page, then when I do it pastes but when save and go to view, it is reverted back again to the prior pasted html.   This is driving me mad....

Also, in old version.... when completing html, ie if putting <div="..."> normally in my older version, the /div would complete, it does not do it in my latest dweaver, i have to type it each time. Seems to want to do it only if doing <p> <container>   or <section>.   

Help... as paying money for something which is totally useless as taking me hours just to do couple things. I have uninstalled and reinstalled, but still the same. Anyone have any ideas please?  Something I need to do? 

I shall also contact 'chat' on customer care, but was wondering if anyone here has had these problems, or similar, or could assist.   Thanks so much.