I routinely snap my Windows to the sides. While working on a piece, I remembered that I needed to update my website store. I opened the Windows File Explorer into three separate windows and snapped them over the Adobe Acrobat and Sibelius pair. When I closed the File Explorer windows, the Sibelius Keypad was missing.
I went to the View tab to see if it closed, but Sibelius said it was still open. Closing it and reopening it did not bring it back.
It was not hidden by any other windows. I closed everything except Sibelius. I resized Sibelius to various settings.
Restarting Sibelius brought it back.
I tried repeating the issue. It did not disappear.
In trying to replicate the disappearance, I found that if I dragged the Keypad below the Windows Taskbar, it would be unretrievable...BUT...if I closed it from the View tab, the small Keypad Icon would show. In the original example, it did not reveal the Icon. Clicking the Icon did not reset the Keypad from under the taskbar to a visible place.
I do not have an issue right now. I just wanted to report it.