Each mod in the download section has a support thread. You will probably get more help if you post there as:
a) We will know which mod you're talking about: it is hard to help without this info, each mod is specific. (Your answer might be there as well, maybe someone reported the same problem before).
b) The author or people following the mod thread will get notified and may help (please be aware that some mods are getting really old, and authors may be gone since then).
Good luck!