Hi,
I would try starting with a new plasma configuration file.
Open a terminal and then execute these commands:
Code:
rm ~/.kde4/share/config/plasmarc
rm ~/.kde4/share/config/plasma-desktoprc
rm ~/.kde4/share/config/plasma-desktop-appletsrc
Then make sure that your session is set to restore.
Open Configure Desktop (Personal Settings) then choose the Advanced tab. Under Advanced User Settings choose Session Manager. Under the category "On Login" choose Restore previous session and then click apply.
All of the Appearance settings are also in Configure Desktop under Appearance. This is located under the Look and Feel Category. You can change different Icon sizes by clicking the Icons category then choosing the Advanced tab.
For your last problem you can set the window to remember its size by going, once again, to Configure Desktop. Under Look and Feel click Window Behavior. Click the Window-Specific category. Choose new. Open up Opera. Then go back to your Window-Specific screen and choose Detect Window Properties. It will give you a cross hair as your cursor. Click anywhere in the Opera window and a new window will pop up. Choose Use window class (whole application). Then navigate to the Geometry tab. There you can choose the position of the window, the size, of the window, maximized horizontally, maximized vertically etc. From what I read you'll want to choose size, then use the drop-down menu to choose remember, then give it a starting point size (It will remember the size of the window everytime it opens and closes).
I think I covered everything in your post. If you have any more questions or one of those didn't work, feel free to post back here.
Welcome to the forums and welcome to the world of KDE4! I think you'll like it here once you get use to all the differences between it and KDE3.5.
Take Care,
Ian