As of Profound UI version 5.4.1 the method used to load data with the "chart url" property changed. The new method solved issues with international characters in the data URL with some browsers. In case of backwards-compatibility issues this flag is available.
When the flag is not defined or false, charts load using the newer, international-safe method. When the flag is true, the older method is used.
Example:
pui["legacy chart data url"] = true;
Where do you save this configuration option? Here