In dark and light mode on macOS Catalina (10.15.6), the UI checkboxes, popup menus, etc all disappear in a sea of white. Text is only readable when the app is in the background and then appear as dim gray text/checkboxes. The SurfaceBrowser has only the hierarchy and no text for each surface unless you select the item. Looks like maybe text and background color are both set to white.
Thank you for your feedback. We’re aware of the UI issues in PVRTexTool GUI on macOS Catalina. The engineering team is working on a fix and we’re hoping to include it in the 20.2 release.