to RedBeard:
Yep, I just run me-dhcp-dns-0.9-rc1.noarch.rpm installation and checked logs of squid and sarg, and since yesterday everything is okay (even after some reboots). The only one thing I've mentioned early is Hunk #1 FAILED at 118, and I personally think that I'll close my eyes on that minor issue. If I'll have time, I'll try check what's wrong there.
But, anyway, I have one more server with SME 7.4 and I'm planning to upgrade it on 7.5 and will try patch from Stefano mentioned bug #2388. So, I'll update on that asap.
RedBeard and Stefano, thanks a lot!