I got a problem after the last update, but only to my main modpack ( 180+ mods ).. I tried with a new instance and I have no issues.. I dunno how to debug this so maybe you could help me.. But everytime I try to place a block using the danknull, it places an 'invisible' block and I have to place a second block in the same spot for it to actually render.. also after the first 'block place' even though the block isn't render, its still kinda there, I get this weird glitch like I get stuck in cobweb but can't move at all through that block..
I downgraded to 1.0.14 and I have no issues anymore.. but with a new instance and with the lastest version I have no issues as well.. so.. it could be a mod conflict? I don't really know how can I debug this as I don't get any crash..

Can confirm with limited mods that this does in fact occur, but im unable to place any blocks in that position. If i do a /fill with air the issue re-occurs when trying to place another block down. Exiting tthe game and re-joining allows a block to then be placed normally in that spot using /dank/null

For me, in SMP with JEI, CCL, WAILA, TOP, SwingThroughGrass, and p455w0rdsLib, it works correctly. So I'm guessing mod interaction. Will look into it and try to figure it out.

http://paste.feed-the-beast.com/view/a508c247 , http://paste.feed-the-beast.com/view/bbbf7ca1

checked the log right after I tried placing a block, this is what I get in the log

so from what I get from that log, the culprit is FTB Utilities I guess, I unclaimed all the chunks and the issue no longer occurs.. so here is the one at fault.. seems like ftbu got a lot of issues recently.. chunk loader not working after world reload and now conflicting with other mods..

ohhhh...that does make sense! hmm...I'll have to do some integration to auto-add my fake player when chunks are claimed...I can see why not wanting a fake player to be able to place a block would be desired..say you have an autonomous activator precisely on the edge (outside) of a claimed chunk, but facing into the chunk..the autonomous activator could then, for instance, place TNT, and then ignite it...so I'll have to special case FTB Utils and figure out a way to auto-add each player's /dank/null fake player clone to the team or something...i've heard FTB Utils actually has a config to disable its ability to disable placing of blocks by Fake Players, but my Fake Player is custom (it'd not a standard Fake Player), and MC actually sees it as another real player..I have to think on this, but i'll figure something out and get it fixed...as for @Morpheus1101 ...his mod list didn't include FTBUtils, so I'm stumped on that one unless CoFH Core does some kind of blocking as well...at any rate, Thank You @DrakusorU !

I have CoFH core, world, thermal expansion on both intances, as long as I try placing a block somewhere where chunks are not claimed by FTBUtilities I have no issues, so I don't think there is a conflict between those mods unless there are some options those mods adds that I don't use or I don't know about them.. anyway, glad I could help you :D

I'm going to close this as #44 resolves these issues :)