Bugs are to be reported in the Bugtracker {
http://www.hydlaaplaza.com/flyspray/index.php } after checking if they are already reported (and possibly closed). In your case it would be useful to search for tasks containing the keyword "portal".
Furthermore: The more detailed a bug report is, the better. This should include the used processor, amount of RAM, exact model of the graphic card, exact version of the operating system and of the graphic driver, and possibly also the output of the command "/pos" before you reach the location which provokes issues.
The forest (sectors hy_bdr#, I believe) contains two waysigns. You can right-click on the floor below them to use an action location which teleports you out of the forest if you come from Hydlaa and can't leave it towards BDRoad or Magic Shop. But I would be surprised if anyone still has issues with this...