So the problems is when i shoot at enemy who is standing in front of me with no obstacles, i cant hit him because it say obstructed. this happens totaly randomly sometimes more than half attacks becomes obstructed, sometimes less. Maybe some one has more info what kind of bug is this and when it will be fixed ?
I think some further clarification on this might help, as there can be a couple different causes for the “obstructed” message to come up. But first, let me clarify that this is not a profession specific bug – it can happen to any profession.
There are two scenarios (that I’m aware of) that can cause your attacks to become obstructed during combat:
1. When attacking a stationary “gadget”: There’s a known issue that when attacking objects, your attacks can become obstructed. We’re currently investigating this, but it’s a widespread bug, so it may take us time to get a fix in. We understand that this bug can make some fights more difficult, and thank you for your patience while we work this one out.
2. When attacking a creature: If you get an obstructed message when attacking a creature, the problem is most likely caused by the map. In this case, it’s something that we have to fix on a case-by-case basis. If you come receive an obstructed message while fighting a creature, please let us know your exact location (screenshots are a big help!) so that we can investigate it further.
I hope this clears things up! 
Invulnarable is a message that often pops up in underwater combat. I assume that this is a different bug.
Long story short, yes.
If this sort of tiny protrusion is able to cause these issues and you have to fix them on a case by case basis with landscape tweaks this issue will never get solved. because there are probably thousands and thousands of little glitches like this spread out across the world (and understandably so!). Any meaningful solution is almost certainly going to have to be one where you tweak/adjust/recode-from-scratch your pathing and obstruction methods.
Thanks for the detailed report! While it is possible, and entirely probable, that this game will always have bugs (e.g. Guild Wars 1 still does, and it’s been out how long? 
), our current solution is to fix these things on a case-by-case basis. We’re always looking to improve the game and our methods of addressing bugs, however, and we may find that there’s a better way to do so. For now, however, we appreciate detailed reports on where you’re seeing this so we can continue to eliminate these issues.
Let’s keep this thread on topic, everyone; if you are having issues with the leashing system (i.e. the invulnerable messages), please post in an existing thread about that issue or open a separate one.
Thank you!
