Cutting and pasting of material into any of the blocks will cause the application to display the internal error message. Using any decimal point in the blocks that call for whole minutes will cause an error message. Uploading a large attachment (greater than 10 MB) generally causes an error message. Uploading an attachment with a long file name may cause an error message - it's best to keep your file names down to ten characters or so when you upload them.
If these don't resolve the problem, please call us at 515-725-8029, and a member of the staff can walk through it with you and probably determine what the issue is.