Hi @alexplans,

Please make sure the "Thumbnail Box Symmetry" option is disabled in Dashboard > Forums > Settings > Addons > Attachments admin page. If the issue is not fixed, then open a new support topic in gVectors Support forum. Here we only support the wpForo plugin.

It seems that the max-width and max-height options that are configured in the control panel of the addon, mistakenly generate a css like this:

element.style {
    min-width: 400px;
    min-height: 300px;
}

and it should be like this:

element.style {
    max-width: 400px;
    max-height: 300px;
}

But it is fixed by the help of @robert

Please make sure the "Thumbnail Box Symmetry" option is disabled in Dashboard > Forums > Settings > Addons > Attachments admin page.