What steps will reproduce the problem?
1.  Fresh install, change fade option on Unit Frames to Hide
2.  Mouseover Player unit frame while no other frames are active, including focus

What is the expected output? What do you see instead?
Tooltip should appear until mouse is taken off frame, then hide. Tooltip disappears nearly immediately after displaying on mouseover.
If any other unit frames are visible, even just focus, tooltip *appears* to react as intended.
However, changing Unit Frame back to Fade out does not make it fade out. Instead it continues to act as though Hide is selected, but doesn't disappear near immediatly after mouseover of Player unit frame while no other frames are present.
Further cycling of option does not change behaviour back to Fade out.

What version of the product are you using?
1.11.43b (r556)

Do you have an error log of what happened?
none at quiet, and setting to verbose keeps disconnecting me

Please provide any additional information below.
The frames are PitBull4.

and FrameXML.log errors:
9/21 21:49:12.128  Loading add-on StarTip
9/21 21:49:12.128  ** Loading table of contents Interface\AddOns\StarTip\StarTip.toc
9/21 21:49:12.128  Error loading Interface\AddOns\StarTip\Localization\enUS.lua
9/21 21:49:12.128  ++ Loading file Interface\AddOns\StarTip\embeds.xml
9/21 21:49:12.128  ++ Loading file Interface\AddOns\StarTip\Libs\StarLibs-1.0\StarLibs-1.0.xml
9/21 21:49:12.128  Error loading Interface\AddOns\StarTip\Libs\StarLibs-1.0\Libs\ChatThrottleLib\ChatThrottleLib.lua
9/21 21:49:12.128  Error loading Interface\AddOns\StarTip\Libs\StarLibs-1.0\StarLibWidgetBignums-1.0\StarLibWidgetBignums-1.0.lua
9/21 21:49:12.128  Error loading Interface\AddOns\StarTip\Libs\StarLibs-1.0\StarLibWidgetScript-1.0\StarLibWidgetScript-1.0.lua
9/21 21:49:12.128  Couldn't open Interface\AddOns\StarTip\Libs\LibMobHealth-4.0\lib.xml
9/21 21:49:12.128  Error loading Interface\AddOns\StarTip\config.lua