I don't know if this is a known issue, but this has been bothering me for
quite some time:
When I am typing the values of parameters in a method call, the parameter
info tooltip overlaps the auto-popup menu with suggestions.
You still can select a choice from the auto-popup menu, but you don't know
which option is highlighted as the parameter info hides it.
This problem is not easily worked around, as pressing ESC first closes the
auto-popup menu and only the second ESC closes the parameter info.
I have attached a screen dump as an example.