See referenced issue regarding what's the problem, as well as under which circumstances it's tested.
Edit; apparently I'm too stupid to reference the actual issue, so here's a link.
ReikaKalseki/Reika_Mods_Issues#1248

• Minecraft Version: 1.7.10
• AE2 Version: rv3.beta build 6
• Forge Version: 1614

This is using the Revolution 3 Modpack, in both SSP and SMP.
Problem also persists, if only using ae2, DragonAPI, RoC and NEI. Only tested for SSP in the minimalist environment.

Sorry, but we will no longer update the 1.7.10 version.

Alright, fair enough. Guess it's not exactly an issue you'll regulary run into.