Translations:Frequently asked questions/18/en

There might be a lot of reasons for that, the most likely is that some library is missing. Try starting FreeCAD from a terminal (type at a terminal prompt,  on some systems) to see if some error message appears. Also, read the rest of this FAQ as it can give you more clues to detect the cause of the problem. If nothing helps, tell about it on the forum, there will surely be someone who can help.