Text scrambled when launching Minecraft while using resource pack

When I launch Minecraft while a resource pack that was created using TextureEnder.jar is loaded, all of the text in the menu, options, and in-game signs becomes scrambled. See attached image for an example. When I launch Minecraft while the default resource pack is loaded, everything is fine. I can get around the problem by making sure the default resource pack is loaded every time I exit Minecraft and then reloading my resource pack after loading Minecraft again, but it's a pain and certainly a bug. I tried this with multiple resource packs created from different texture packs; the only way text appears correctly is if Minecraft loads while no resource pack is loaded. Going to the default texture pack while the text is scrambled does not solve the problem.