I tried all the fixes above which seems to help but randomly it breaks when I hit refresh.

same result, tried all fix idea's but getting random results.

any other idea's besides changing templates ?

Mine also having same issue. But after I changed as following, it stop changing column randomly every time refresh browser(firefox).
But still, there needs to be update in 1.3.
Seems like even if I change size of thumbs in {gallery}folder_path:thumbs_width:thumbs_height:display_mode(1 or 0 thumb){/gallery}
doesn't change the container size which defined in default.

This evening I have tried many changes and I have found the solution that work well in my case...

In the file sigpro_default.css (or sigpro_yb.css) I have modified this row...

/* --- Thumbnail styling --- */
.sig {clear:both;margin:0px;padding:12px;display:table;/*position:relative;*/}

... in this mode ...

/* --- Thumbnail styling --- */
.sig {clear:both;margin-right:auto;margin-left:auto;padding:0px;display:block;/*position:relative;*/ width: 100%;}

I hope this is usefull also for totoymola.

Ciao.

Same problem, none of the fixes work, and my CSS is fine.

If it is helpful :  The problem *only* occurs when :

I have a menu item linking to a 2-column display, and there is only a single content item published in that area.

It looks like the first column (and thus, the first and only content item) is matching the size of the thumbnail display, and then ordering the thumbnails and text into a narrow vertical column.

If I link to the same content item as a 'content-link' - the problem doesn't occur.

/Update/ The problem occurs in any instance that content is to be displayed in an effective single column.

Anyone found a fix for this yet?

Well, I found a partial fix.

In the file sigpro_default.css (or sigpro_yb.css)

change "display:table" to "display:inline"

That worked for me.

Have same probleme here with rt_vortex.
switching between single and double lines.
None of the tips above helped me.
I just wish i dint bought this  >:(

I've read all posts I could find on this problem of thumbnails displaying in one column but in my case (SIG 1.2 with RocketTheme Hivemind on Joomla 1.5.1) it works in all browsers except Explorer v6 and v7. Firefox is fine on PC and Mac as well as Safari.
You can see it here www.galerie-latham.com/sitev2/index.php?option=com_content&view=section&layout=blog&id=8&Itemid=56

Previous suggested changes are already made or not working.

Any ideas ???
Thanks

I have just bought this and think this should be solveable by a css wizz !

Any out there ? I have tried a few of the other solutions, really ruins the look of the page which is not why I got this, like it otherwise, until there is a catch all solution Id save my money.

I fixed the problem of thumbnails displaying vertically on one column in IE6 + IE7 with SIG Pro 1.2.

I realized that the contentpaneopen in Joomla (with Hivemind template) collapsed in those browsers although the style is set to a width of 100%. So I just added in sigpro_default.css on the .sig class a fixed width in pixels corresponding to what I needed: <.sig {clear:both;margin:0px;padding:0px;display:table;/*position:relative;*/ width:600px;}>

I still think there is a problem in the way CSS are done in RocketTheme Template but I didn't tried SIG Pro with another template.