Hey folks.

We are absolutely looking into the issue and seeing if we can get it fixed. I will post here when I have something solid to report.

Yep, here is what we know:

We have identified an issue whereby certain ISPs and/or certain types of router can cache and then serve outdated, or stale, versions of web requests made by Warframe (thus causing old alerts to remain visible, or build timers not to progress). We are currently developing a solution that would prevent such caching. Until then our best advice is to attempt to disable any caching on your router (power cycling it may temporarily purge its cache), and ensure all Warframe-related ports are open (more information on this is available here: https://www.warframe.com/firewall) 

Thank you for your patience, and we suggest that if you are not fluent in how your router works, you should contact your ISP or look at your user manual. Some routers may have these settings shut off, so you may need some help from your provider.