Simple question, but did the Unsharp Mask ever remember its previous settings, or has it always reverted to Percentage = 100, Radius = 1, Threshold = 0?
Many Corel tools need to click "Reset" to be reverted, also "Unsharp Mask" needs this resetting as I know.I also do sharping by Photoshop setskill: Copy the photo twice in layer modes, then in top layer set up: Soft Light - High Pass: Percentage 95, Radius 10 or 17. Two top layer merge and to compare with background layer. Try it with different setting, Maybe it fits you.
Sorry, my initial post is contradictory. If I set it to, say, Percentage = 70%, Radius = 2 and use it, it will revert to the default of Percentage = 100%, Radius = 1 the next time I use it. Other sharpening tools remember the last setting, this one doesn't seem to.