After booting my pc up I noticed that the fonts on the login screen on my Lubuntu 13.04 are tiny. After logging in I noticed window titles being tiny and default font sizes in apps too such as Skype or LXterminal - unreadable even.
Fontsize was Ubuntu 11 as usual - changed everything to size 14 but it only changed titles and they are still smaller than they used to be.

Looking for others having similar problems, I found this command:

xdpyinfo | grep resolution

resolution:    59x60 dots per inch

which seems totally ok.

By the way Chromium is unaffected besides the title bar and menu.

What can I do?