original report modified by wroot to make it more clear and obsolete things are removed (like Actions menu hotkey, there is no such anymore):
Spark > Preferences:
Chat: Alt-C is in use 3 times, Alt-S, Alt-D are in use 2 times. Onlu the last works.
Login: Alt-S is in use 2 times.
Sounds: hotkeys aren't working. Probably because hotkeys are set in the middle of the words (not capital letters). Same bug is afecting other similar settings in Appearance
User Profile > Business: Alt-C 2 times, Alt-P 3 times. Same problem with not capital hotkeys.