I am using Scribus 1.5 on my Mac OS X Yosemite 10.10.5. I have a test-1.png and a corresponding test-1.pdf file (attached). When I try to use the "Insert -> Image Frame" and choose the pdf file, it doesn't appear in my Scribus document. It complains about the file missing or is corrupt even though it can preview it.
When I try the same procedure with the test-1.png it shows up no problem. Interestingly, when I export the document as a PDF then start a new document and try to image frame the exported PDF the same error appears. Is there an issue with my workflow?
I've attached test-1.png, test-1.pdf, and Document-1.sla file with the image frames.