I've been getting this error after the Mojang screen.
RailcraftInstallationException: Railcraft Client 3.2.1: Invalid Network Entity ID!
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There was an issue assigning entity network IDs.
"net.entity.cart.bore = 124" is invalid or used by another entity.
Please adjust your railcraft.cfg file.
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--- END ERROR REPORT bc8f7d63 ----------
Any ideas. I've have dug through the forums and couldn't see anything like it. Running OSX 10.6.8. I looked into updating java, but I too can find nothing for mac. Technic works fine. Server is up and running...just can't get the loader to open Tekkit.