Black Lion Trading Post Coming Up Blank
That sounds like some sort of browser issue (the TP is basically a custom browser, displaying like a web page). It turns out, some browsers can override your computer’s settings (due to an OS bug, a browser bug, or sadly, malware).
If you know how to troubleshoot browser settings (or can google it), start there.
Otherwise, create a support ticket and ANet will help you track down the core issue.
From elsewhere:
shadow.6174:In case of TP, maybe clearing its cache could help. TP cache lies in your Temp folder (if in Windows type temp in the Windows search box) in a folder called like “gw2cache-{bunch-of-numbers-here}”. Just delete that folder while not in game and restart the game. I hope it helps.
Ah, the browser was certainly the issue. Just deleted the temp file then ran CCleaner and that fixed it. Thanks so much!