This bug was marked as fixed and was closed. However, it's quite obvious that it isn't. Not only that the projectiles still get stuck, they also make their bounce sound repeatadly while in that position which makes it very annoying.

I suggest opening this again until the issue is really solved.

(Note I'm aware Xaser speculated that it could be a ZDoom issue but that doesn't mean it isn't an issue that needs to be take care of)
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Edit: (Mon Jun 04, 2012)*

Is it just me or is quite a chunk of the hell part comprised of long, windy hallways and corridors that are somewhat confusing to navigate?

Also, speaking of the hell part, I hope the next contributers give it the attention it needs. Because I've got to tell you, that part is really lacking in pretty much everything. In addition, with that Devil May Cry ambient music playing in the background, the creepy hellish atmosphere is a must, I'd say . Because as it is now, the music isn't that fitting.

* I didn't want to make a triple post.

I'm ready to improve a few areas with appropriate detail levels - I have ideas for Hell I've been experimenting with in a map pack I'm making on my own... and I'm ready to make the underdetailed areas of the later base 'Hell Influenced' to a degree similar to the good base parts! I can actually make a few things ahead of time but of course I'll modify for real when my time comes!!!!

Yes!