It happens here, too, with Fences Pro, on Windows 7 Pro 64, involving shortcuts to programs on a local drive. There are two USB external drives on the machine but no icons from them on the desktop, and there are no mapped network drives.
Please consider moving it from potential update to definite update. The reason I just bought Fences Pro after trying Fences Free is that I thought it would allow this, but apparently I was mistaken. Please, please do allow for arbitrary placement of icons within fences. That is, please make the icons remember exactly where they've been placed in a fence. No grid alignment, no auto arrangement. Where I put it, please let it stay right there. Thanks! Cool program... Stev