It seems that xfwm4 calculates new window position wrong. When it opens window it places it sticky to top-right (which is absolutely normal). Window however starts ABOVE screen and slightly right of left screen border. My XFCE setup consists of 1 workspace only. I can provide all necessary details on request.
Created attachment 104 Misplaced window - it's SciTE, but it occurs on every other freshly open window.
One more thing (maybe it helps): maximizing of such window by taskbar works fine, but maximizing by program manager misplaces it again. If I maximize window by taskbar again - everything works fine from then. Sorry for such incomprehensive comment, it's getting a bit of late ;)
I can't reproduce the problem. This, however, sounds like a bug that has been fixed a while ago. Can you run xfwm4 --version and post the result? This is to make sure that there is no other version in the PATH.
Of course. This is the result: ry2n@tux:~$ xfwm4 --version This is xfwm4 version 4.1.90 for Xfce 4.1.90 built with GTK+-2.4.9, linked with GTK+-2.4.9. It seems that you were right :| It's my fault. I should have investigate outcome of xfce4 installer... it installed with /usr prefix, but it loads from previous version installed with /usr/local. I'm very sorry for this.