These are some simple things that have fixed common minor problems I run into within the game.
1) log out to character select-
this works for stuck in combat, can’t move, some issues with ui not responding
2) log out to the patcher/loader screen then log back in completely (or close/reopen game) -
if the trading post is telling you that you are not authorized this fixes it, and sometimes the guild/party issues. At a guess you are being logged out of the trading post when you sit too long on character select or are diconnected due to inactivity, relogging fixes it
3) for the more major but still individual problems, such as water is missing/invisible, not seeing yourself when stealthed, not seeing yourself when transformed or in a golem suit or similar, and not seeing special effect such as the tornado (also a transformation I guess.)-
***close game completely, the patcher/loader too, right click your shortcut, click “open file location”, delete the file gw2.tmp, restart game
The gw2.tmp file appears to be a caching file for the game that isn’t allways handled cleanly, if worried about the deletion, remember you can restore from recycle bin. The game rebuilds a new one on login though.
Anything I have seen that these simple steps doesn’t fix has so far been a server side issue that everyone suffers from.
I would appreciate dev/tech verification on the relevance of that gw2.tmp file though, just for personal info.
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