The breaking particles thing I thought was fixed a long time ago. I remember going through the pack busting things and making a list on the old forum post for Zomb. Perhaps you downloaded a bad version? Or perhaps something broke again.
How go things Druha? Looks like no one has popped through in some time.
I'm still here, and yeah, I haven't updated things in a while. I've been working on other things lately. I got into 2 different Alphas for new games, I wrote a shop generator application for DnD 3.5, and I'm working on making a new table-top RPG system.
Back to the topic of this resource pack. I too thought I had fixed the breaking particles. I unfortunately didn't make the 3d models and am not as knowledgeable about Minecraft's 3d format as Zomb was. I can check and give it a shot again, but I promise nothing.
As for the log, the round part of it actually pokes out into the next block over and signs have a fixed position within a block, which as far as i've been able to figure out, can't be changed dynamically based on the surface the sign is up against. A solution would be to change the model of the rounded logs to be smaller and not poke out of the block. Maybe I'll take a look at that some time.
Other than that I'm just waiting for 1.9 to come out and then i'll update the pack again. And I'm still not happy with the sheep texture so look for a new one in the future.