Your browser does not seem to support JavaScript. As a result, your viewing experience will be diminished, and you have been placed in read-only mode.
Please download a browser that supports JavaScript, or enable it if it's disabled (i.e. NoScript).
@aha_1980, thank you for your answer!
This was indeed the problem. The library was compiled with Visual C++. I changed the compiler in Qt Creator and the problem was solved!