Unable to open Printer properties
Tried control + p
clicking from the menu
both when connected or disconnected from printer.
Running as admin.
Key shortcut may not work depending on where focus lies. Hitting the printer settings button should always work. For me both worked as expected.
Any hints in the log?
Maybe a illegal value prevents it from opening. You could check in regedit.exe for HKEY_CURRENT_USER/Software/repetierHost and rename it and start. Would build a new config with default values. At least then it should work.