Trading Post - Buy Button Greyed Out
Update: Logging in today I was able to buy things as usual. So either time or a full client restart was the answer.
There are all sorts of reasons the TP glitches, most of them are due to an issue on our end of the system. Some are easily resolved by restarting the game. Some require more work to resolve, so if it happens repeatedly, I recommend you contact support. They have a very good track record troubleshooting the underlying issues and preventing them.
There are also some stickies in the technical forums that help, e.g. ensuring you have UAC (i.e. admin permissions) or that your anti-malware software (esp. AVG) is allowing the trading post app (awesomonium_process.exe) to access the web.
John Smith: “you should kill monsters, because killing monsters is awesome.”