The PDF preview fails saying that the pdf file cannot be found, when working on a symbolic link to a network folder. Compiling the PDF definitely works.
Steps to reproduce on Windows 7:
Have your tex file stored on a network folder: \[machine]\targetFolder
Create a symbolic link to that folder. In command window put:
mklink /D C:\previewFailTest \[machine]\targetFolder
Open tex file through that symbolic link and compile and preview.
Tex Studio says it cannot find the respective PDF file although the PDF file has been created.
Sorry for messed up formatting. There was no option to preview and I seemingly cannot edit the bug report.
This is a Qt Bug: https://bugreports.qt.io/browse/QTBUG-20791
Nothing we can do about it.