imports issue

 I am having a strange issue using PyCharm Professional.  I set a remote interpreter, and when I look at the list of packages in the Project Interpreter panel of Preferences, all the packages I expect to be there are there.  They also import without issue when I spin up a Python console using that same interpreter.  However, many of the packages that I can see in the list and also import in the console show up as "No module named {blah}" in the editor itself, and the variable completion doesn't work.  I've tried invalidating the cache and adding the library paths by hand, but nothing seems to work.  Has anyone else had this problem?