You can upload your export on https://transfer.xibo.org.uk and then paste the link here - we will get it from there. If you’d rather noone else saw it you can PM the link to Natasha.
SurfaceView (in Display Settings Profiles) only effects Video Widgets and has no effect on images, text, etc.
All text in Xibo is shown as web content, meaning the white squares (which you’ve said are text) will be trying to run in little embedded web browsers.
It looks to me like the embedded browser is missing completely, as opposed to being loaded but empty. In either case this shouldn’t happen.
As this is a commercial player, if you’d rather contact the Help Desk (support.xibosignage.com) then you are very welcome to do that - your response on there will be quicker than on this community forum. We monitor it as much as we can, but its a community rather than a support system.