Cannot Save Units within Courses

Hi, I have researched this issue and have been unable to find a solution, but I think it is related to some method that my server may not have activated.

This is my issue: I am currently unable to save any units within my courses. It keeps giving the "an error occurred, unable to save units." Is there a fix or patch for this without leaving my server vulnerable? I really love your system and think it will work perfectly for my project.

Help is much appreciated!

Thank you,
Joe