This is my first time on here. I've had a scout through the topics and can't seem to find anything to help with an issue I'm having:
I've been developing Thematic child themes (thanks for this Ian, really an amazing job) for clients since the middle of last year. I have a reasonable (though self-taught) grasp of CSS but know next to nothing about php. I've just launched this site for a client:
and tested it in Firefox (3.5.4), Safari, Chrome and IE back to 5, on XP SP3. All fine (barring the usual IE crud in early versions, although it does render better than the MSN site). The client uses Safari on Mac OSX, no problems there either.
Some of their visitors however are having horrendous rendering problems, seemingly all in Firefox on XP. Some were positioning issues which I think I've since fixed (double-margins on floats/display inline etc.) but one has completely random styles i.e. no images or backgrounds, calendar text being black on dark grey (instead of white on dark grey), wrong sidebars showing up on certain pages... The other is seeing the original Thematic layout with none of the child theme at all. As they're using the same browser and OS as me I can't for the life of me work out what's wrong, other than their own system/browser settings. It's not even that they have styles turned off as one at least is getting the base level Thematic styles, just no child theme. Am I missing something really basic? Surely if their browser settings were messed up then every site would look bad?
Apologies if the answer is on here somewhere, I have tried to find it. Any help much appreciated. Screengrabs of rendering issues are available if nec.