Apologies for the delay gents. This has taken me a while to track down, and I'm still not entirely sure of the fix. I haven't been able to duplicate the issue on my end but there seems to be one of two things going on:
1. COOKIES ... From the server's error logs it seems that the "security' issues some of you have been experiencing coincide with authentication errors, and these seem to be related to session cookies. Each time you visit the site, you start a new browsing session which your browser stores as one or more cookies. This is how you can move from page to page and retain browsing preferences and have the site authenticate you. If, for some reason, your browser can not read your current session cookie, it will throw an error and/or show you a blank page.
THE FIX: As some of you have already discovered, refreshing the page usually fixes this. When I notice this kind of weirdness happening on sites, not necessarily the SFBC site, I restart my phone. I actually now make a point of restarting my phone every day. This clears any background processes left over from whatever programs are running that consume memory.
2. ADS ... While it may appear these issues relate to the ads you're seeing, I don't think it is. The ads refresh every 15 or so seconds starting from when you first land on a page. And, once per session, you see an ad on mobile that covers the entire page that you need to click past. This will only happen once per visit. From a file size perspective, these ads are very small and take up a fraction of the memory it takes to display the site.
Like the fix for #1, try restarting your mobile device, not just closing the browser, but actually shutting down and restarting your phone.
Let us know if you notice any difference and, like before, feel free to send us your screenshots.
Cheers,
Chris