http://www.quickandeasywebbuilder.com

Did you try all suggestions?
http://www.quickandeasywebbuilder.com/f ... 10&t=40319

Note that version 4 does not support 64bit.

For me, the CSS menu does switch to the ResponsiveMenu. However, the CSS is still visible in the breakpoint. To prevent this, select the CSS menu in the Object manager and toggle the visibility. Also, I recommend to also add the ResponsiveMenu to the page header, otherwise you cannot make it overlap...

Should I convert the images into .ico files first?

yes, you will need to convert the image to an icon.

Also, you will need to publish the page, most browsers do not support local fav icons.

I think the breakpoints from the master will not be included, because there is no matching style sheet.
Both the master page and content page should have the same breakpoints.

I guess there should be any info about the published file (location, size)?

This option is meant to select a different file or in case of a folder, to rename the folder.

I'm sorry, but the filename is not valid/web safe.
Filenames should not start with a number.
Also, there is a space in the filename.

See this related FAQ:
http://www.quickandeasywebbuilder.com/f ... f=10&t=131

I was referring to the file name of the image.
What is the URL of the page so I can see what you have done?

You can duplicate this with layers /layout grids and the background size set to 'fixed' or 'parallax'
http://quickandeasywebbuilder.com/parallax.html

Maybe the file name is not web safe or the format is not supported by the browser?

See this related FAQ:
http://www.quickandeasywebbuilder.com/f ... f=10&t=131

A flexbox container can only contain flexible objects.
A layer is a (fixed/absolute) container so it cannot be used with flexbox.

Flexbox is basically a modern way of aligning elements, so it was designed for multiple elements.

Related tutorial:
http://quickandeasywebbuilder.com/flexbox.html

Some browsers intentionally block 'auto play' when the video has audio.
This is a browser 'feature'.

Also, note that auto play is standard YouTube functionality, this is not something specific to the QnEWB.

It looks like a system related issue.

Note that this is unrelated to QnEWB.

But maybe this will help? See also:
https://askubuntu.com/questions/548557/ ... atk-bridge

i start wondering whhich is the executable file!? It is 'qnewb', isn't it?

Correct

I do not want to use deb file there;

But did you try? Installing the deb file should automatically install the missing libraries.

Did you install the correct version for your platform? (64bit vs 32bit)