I'm still having issues with torch placement suddenly not working, but moving around my world seems unaffected by this. I was traveling back to a vein I'd found and heard a zombie noise, found a small puddle of water with a zombie in it deep underground, killed the zombie, and went to light up the place. I couldn't do that because torch placement suddenly stopped working. I relogged after traveling back to my base location around 200 blocks in x,z directions distant and was able to place torches after fully exiting out of it and restarting. I ended up filling in the pool of water, it was so small, anyway. It seems that there is a server/client desync issue here, because the torch placement seems to go wonky all of a sudden. This is torch placement either using EnderIO's Dark Pick or right-clicking to place it whilst holding the torches. It seems to happen randomly and without apparent cause.
This is making this modpack unplayable for me at least until a fix can be pushed for it. I may end up playing more Infinity Evolved Skyblock whilst waiting for something to do. That skyblock modpack is very grindy, but doable.
I look forward to seeing when Jason and the others working on this modpack can get a fix for this released. I would submit a crash report if I had any to submit, but apparently that doesn't happen. Are FTB logs of a play session of any use in debugging this? If so, I might submit one next time it happens, if I can find the time.
Also, before anyone asks, no, I don't play two modpacks simultaneously, this PC would probably fall flat on it's Desktop if I tried that. As for Windows 10, there was a recent Java update, I'm unsure if this had anything to do with the issues, though, as I recall similar incidents before Java was updated.
Cheers ...
BrickVoid