Board Thread:General Discussion/@comment-173.71.27.18-20130205012319/@comment-5627887-20130604161352

I can only suggest backing up your worlds, and uninstalling and reinstalling Tekkit Lite. At the very least check you are playing on the latest version (0.6.5).

Edit: Oh and of course using any texture pack other than the default would bring into play the possibility the texture pack is to blame.