Right click Inner Space and select Configuration. At the bottom half of the Configuration window is 32/64-Bit settings, with 2 settings that apply to your question. 1. "Use 64-bit Inner Space Uplink" --- you want this to be ticked; and it should be ticked by default. 2. "Use same-bit game clients if possible (e.g. 64-bit client for 64-bit Inner Space)" -- you want this to be ticked as well, and it should be ticked by default as well. These settings are there to eliminate crashes many people previously reported when launching 64-bit WoW from 32-bit Inner Space and vice versa. Anyway, tick both of those, click Apply, close and restart Inner Space, and you should be good to go.