Hi Tran Huy Quoc Bao,
i think that is the problem:

I don't using development mode and edit direct in css instead of less, and i don't using compile so that cause the issue ?

I found this document that explain how thememagic works:
Thememagic

Here below a brief offprint:

How does Theme Magic work?

Theme Magic uses LESS files to interface with the template variables file to make changes to the Joomla template in real time. It allows the user to create multiple preset settings by storing custom LESS variables, which are then used to populate the theme with........

hi ,

i am having same issue , theme magic is not auto updating the preview.

tested on : firefox, chrome
template: default t3 template
development mode : Yes

Regards
Deepak

Hi gemini_geek,

As the performance issue, we have remove live preview function.
Please press 'Preview' button to after change something.

Regards

Hi,

I just check the tool in our server and it's working properly: http://easycaptures.com/fs/uploaded/873/1935013410.png
Could you please pm me your site url, admin account, I need check how it works in your site.

Regards.

Hi

I know this post is old, but I'm very new at this t3 framework and I am encountering similar issue that the theme magic preview panel always show default theme color. It doesn't matter if I chose dark or red it always show default. I did turn on development mod when using theme magic. The preview will show change if I make change otherwise for instant if I choose dark theme to start changing it always show the default (blue look), I have not make any change to preloaded theme and I expect when I choose red theme it it show corresponding theme in preview panel. Please advise. Thanks

we've got the same problem. there is no preview, doesn't matter if i click on "preview" or not.

Hi Lilia

It's great if you can pm me your site url and admin account so I can have closer check.

Regards.