multiple tabs: certain web pages not loading (Opera 11.52. + Opera 11.6 beta)

Hi - I have two x64 Windows 7 machines running Opera 11.52. I have a big problem with certain web pages not loading at all in their tabs (or not fully loading) when there are already multiple tabs present.

For example: I can have say, 20 different web pages loaded in the tabs, then when I try to visit another webpage like opera.com it won't load it at all - the tab displays a blank page with an endlessly rotating icon in the tab. But if I go visit amazon.com that web page will load perfectly. The problem with tabs not loading has been an issue for me with a couple of Opera versions now. Even in the latest 11.6 beta version the exact same problem persists.
It is getting to be very annoying because even this forum page will not load at all. As a matter of fact I came here with Firefox because this forum would not load in Opera. Firefox has no problems on the same machine with multiple tabs.
Just imagine, I have Firefox installed for the sole purpose only of viewing pages when Opera will not load them. Every time a page will not load in Opera I have to copy the link then fire up Firefox and paste the link.

1.) It seems to be getting worse, because on my laptop x64 Win 7 system this problem appeared when there were not even many tabs open. In this case I had only 6 pages open that belonged to freewaregenius.com and 3 or 4 from some other sites. What happened was that the tabs from freewaregenius would this time only load about 20% showing only the top banner and nothing else. The remaining body of the pages showed blank space and reloading would not help. Even restarting the browser would not help. The pages from the other sites however loaded fully.

2.) Another related problem is that some pages may appear to have fully loaded but still the rotating circle icon in the tab keeps rotating endlessly until I press escape.

3.) Yet Another issue with Opera which seems closely related to this issue is the big dialog box that pops up very often when starting Opera but before running the actual browser and suggesting there was a problem when Opera was last run. You are given an option how to start opera and you can choose from saved seessions. You can also diable Opera Unite here. Opera won't run before you click ok in that dialog box. I don't actually read the message anymore so I can't remember now what it says.
So, in effect, I have similar problems to those mentioned on this forum page I found today: http://my.opera.com/community/forums/topic.dml?id=852392
There it was suggested to try turning off Javascript which I now did. That actually makes loading pages possible but of course this is makes no fix and no permanent workaround at all. But in any case we now know the problem somehow connected to scripting and that's a good lead from where to develop a fix.

With over 200 million Opera users, which is more than the number of people who drive a Toyota and double the number of people with an iPhone, this issue must have appeared on lots of machines not only my 2 little machines and those over at the Opera Linux forum.
I hope that eventually this issue will get fixed.

Thanks a lot for your attention.