Below are some specific combinations of features that can cause trouble when you go to report on your data.
Using Merge Codes as a Row Header
Merge codes are really cool. Everyone that uses them has had that moment when you realize the possibilities of merge codes. Generally, merge code are both a safe and handy tool. However, we discourage using merge codes in row headers of grid questions. Because merge codes do not populate in SurveyGizmo reporting this data will not be sensible.
The one exception to this rule is if you plan only to use exports of your raw data, then this data can be used, albeit after a little data processing.
Changing Reporting Values in Custom Table Questions After Collecting Data
This is just a no no. These questions are incredibly complex and changing the reporting values will significantly affect the way the data is stored and mapped.