This has been an issue I've been fighting in Flexi for several weeks. I pull in a .png or several of them, in order to create a gang sheet for shirt transfers. When I save as a .png, some of the images will have a white background. Not all of them, just some of them. I'm saving, my options are not supressed and I make sure transparency is selected and I still have the same issue. If I save as a .pdf, everything has a transparent background. I do have suppliers that will only take .png files, so this is an issue. I'm running build 4393, and I just check and they have build 4919, so I'm currently downloading it and will install to see if the issue has been resolved with the new build. I'll come back and let you know if it resolved the issue.
Update* Build 4919 resolved the issue.
Not sure they have fixed all the bugs in the new build yet. After installing, Flexi was crashing on start up. Restarted my
computer, fixed. Having trouble saving files right now, I get the dreaded spinning wheel.