syraxes's questions

I've just installed Ubuntu Mate 16.04 and am encountering a very annoying problem.

After using the pc for a while:

• it becomes impossible to change focus to another window by mouse click
• it is still possible to use Alt+Tab to change focus, but the window doesn't react to mouse clicks
• it is not possible to click on desktop buttons (application/places/system) and also it's impossible to move/drag windows

The really weird thing is that I was previously experiencing the same problems in OpenSuse leap 42 with different desktops (KDE plasma, xfce, icewm). It was very annoying, and that's the main reason why I reinstalled Linux and tried Ubuntu Mate 16.

I'm starting to suspect that this is bug in recent versions of X.org which is present in any recent distribution. I don't think it's a hardware problem (in win7 I have no issue).

Did anyone see this problem? Any suggestion or solution?

Somehow, on my computer at work the default application for JPG files is ... wine ! Wine is not even installed anymore.

I can "open with" other applications. But no matter what i've tried "wine" still remains the default.

I want to completely delete the "wine" from the list of applications that can open JPG.

Is there any application that would allow me full access (see, edit, delete) to all the file associations for ALL the file types ?

Did anyone ever experienced a home directory mysteriously becoming non-executable?

The context:

Ubuntu 10.04. The vsftpd server is installed and running.
I have created a regular user ftp_poze.
Another application uploads via FTP some files into the ~ftp_poze/images directory.

What happened:

For some strange reason, the FTP uploading stopped working.
When analysing the situation, I found /home/ftp_poze and /home/ftp_poze/images with some strange permissions 0440

The user was no longer able to access its own home directory!

I have already fixed the directory permissions, but I need to understand what did actually happen.

Does anyone have any idea about what could have caused the directory permissions to be changed?

I am certain that it didn't happen due to human intervention.

I have two monitors and a ATI Radeon 5750 video adapter.
Using ATI's catalyst control center I am able to configure the displays so that the desktop spans over the two monitors.

The multi-desktop settings are preserved when logging with KDE. It was also working properly with gnome and unity (when i used to have them installed).

BUT: when logging in with XFCE the second monitor is cloning the first (instead of creating an extended desktop).

I can enter into ATI's control center and reconfigure the desktop. But the settings are lost when i logoff !

Does anyone have any clue about what is happening here ? Why does the Xfce desktop uses some wrong multi-monitor settings ?

This problem appeared first when i upgraded to 11.10 (about 2 months ago). And now after upgrading to 12.04 the problem persists.