Voltz 3.1.1 has a bug involving grief protection on SMP servers. The impact on single-player experience should be minimal.
We are maintaining 3.1.1 as the recommended build for the time being, until it's clear whether a timely fix will become available; if not, we'll be rolling the recommended build back to 2.0.4.
In the meantime you can manually select 2.0.4 by selecting the small gear under the Voltz modpack icon, choose "Manually select a build", and pick 2.0.4 from the drop down menu as illustrated below:
This is just a heads-up, since we've taken so long to get around to it. The platform, launcher, and solder should now support Minecraft 1.7.9 and 1.7.10 packs. No action is required on your behalf, those Minecraft versions should appear anywhere Minecraft versions are selected. Due to a sorting issue, 1.7.10 will not show up near the top, but further down the list. We're investigating this issue currently. Have fun!
Attack of the B-Team 1.0.12a is now marked Recommended in the launcher, and users will be asked to update the next time they attempt to launch B-Team. This is a large update over 1.0.10b, and includes a number of mod updates.
The build includes the following changes:
Server owners can obtain the new server file from the following link: http://mirror.technicpack.net/Technic/servers/bteam/BTeam_Server_v1.0.12a.zip
Due to the number of changes, we recommend server owners update all mods and config files.