I had the same trouble with 2 different relases of winpython 2.7. After installing package "quantities", the control pannel do not display installed plugins anymore. So far, I had found that it is ...
File "C:\Users\djb\Desktop\WinPython-32bit-3.5.4.1Qt5\python-3.5.4\lib\site-packages\spyder\plugins_init_.py", line 511, in toggled=lambda checked: self.toggle_view ...
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