I'm using Ubuntu 12.04 for a month or so. Probabbly due to the last system update, I am having the following problems:

1. I have lost control over all apps windows. I had configured them to show up the control buttons (minimise,maximise,close) on the left upper corner, now they only show them when the window is maximised.
2. I am not able to resise a window, when not maximised.
3. The window which has the focus mixes up with any other window behind it, no matter what style I choose for them.
4. The terminal window does not show up. Only its header shows up in the "menu bar". I know it is active, as I check it in a standard terminal (Ctr+Alt+F1) using ps, and can close it using Kill or going into GUI mode and choosing "file/close window" (I am not sure what are the menu reading in english as I am using a portuguese version).

What can I do to get my windows under control again.
My system is as below:

Ubuntu 12.04 LTS (precise pangolin)
Kernel 3.2.0-31-generic
Xorg version 1.11.3
Video: NVIDIA UNIX x86_64 Kernel Module 295.40
Compiz 1:0.9.7.8-ubuntu1

Many thanks for any help.