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Yes, you can customize the blog templates. They use standard HTML /CSS code.
The templates are stored in the 'blog' sub folder of the program files.

You can use multiple master pages (not master frames) in one page.

The resolution of the screen may not the the same as the browser's viewport.
Also note that the browser will select a smaller breakpoint than the viewport, so it will select 485 for 720 (because 768 will not fit)

If I simply upload the signup form as produced using the Signup sub-menu item under the Login menu item, then it doesn't send the full details entered, just the User name and Password. Correct, that was how it was designed . I recall we had a similar discussion two years ago, but I did not add this...

I'm sorry, there are no other options to wrap text around images than the ones you mentioned.

I'm sorry, there is no extension for this. This will require a third party script.

Correct

The second project is not setup correct.
The default view should be the largest view. So, please remove the 1280 breakpoint.

Also, the 'overflow' property of the header is set to hidden, this means that all objects will be clipped.

- you do not need to publish the master page.
- if you want to add the code to a master page then it should be in an HTML object, set to 'between head tags'

This is most likely because there is a conflict with the 32bit version using the same system folder.
I will investigate if it's better to use separates folders to prevent confusion.

Either import the styles from another (new) project or manually verify the settings of the styles within those from a new project.

I would not make too much changes to these styles unless you know what you are doing.
For example, removing the margin or display:inline will affect the behavior of text with headings.

Regards the text taking on the opacity setting of the layer shape below it - I find the same thing happens if i use a shape. This is normal HTML behavior. If you change the opacity of the container then it will affect all child elements. If you want a semitransparent background then you should set ...

For performance reasons, the application will not render text shadow. This is behavior by design, because recalculating shadows during design time would make the software extremely slow.

Master objects do not include Page HTML or Page Properties, only the object will be included.
If you want to add HTML code to a master page then you will need to use the HTML object.