Thanks a lot for your kind answer. I will check the bugs list.

Thanks. I think I didn't make myself clear. My problem is with the Layer Styling Panel and other panels, not the canvas. Look at size of it... the fonts the buttons, everything is huge. Sometimes I have to drag the layer styling panel to almost the middle of the screen to see all buttons. The buttons on the toolbars are ok, but fonts and buttons on panels are extremely big.

My problem is basically with the interface of the layer styling. Fonts and icons are huge! Compare the size of the fonts in there with the icon size on the top of the program.

Thank you very much user12711. Your approach fits a lor better what I'm looking for. I will give it a try.

Thanks mapBaker. I will give it a shot to Postgresql. I really thought this should be a lot easier.

Thanks a lot for your answer. The fact is that we are a small mineral exploration company, and I'm basically forcing everyone to use opensource software. Libreoffice offers a very complete package for office applications. In the past we managed our exploration data as Excel files, and that has major data loss and corruption risks. We also use QGIS to map our exploration databases, so it made sense to me trying to connect them.

No solution to this problem. I´ve installed the 32 bit version and the problem is still there. Any ideas or workarounds?

Thank you MappaGnosis. I run QGIS on Windows 8. How can I attach a screenshot here?