ok, was that with context tagging in the find symbol toolbar or did you have to select an explicit tag file?
Did the drop-down list ever work for you (with STL classes) or has it never worked?
Next thing to try : open up one of the sample workspaces - on the project menu, select "all workspaces" -> "sample workspaces" -> "vs2003.sln". Open the file cpp.cpp from that project and add std::vector<int> abc; abc. and see if the dropdown list appears. If that works, try creating a small new project yourself and see if the drop-down list works.
If that still doesn't work, there may be something corrupted in your state file (vslick.sta in your configuration folder). There's several ways to find out if the state file is the problem.
Method 1
With slick closed, backup your entire configuration folder, then delete the vslick.sta file (or vslick.stu) and also delete vrestore.slk. Run slick and see if the drop-down works.
Method 2
When you invoke slick, use the -sc switch to select a temporary configuration folder i.e. vs.exe -sc some-new-empty-folder. Slick will create a new configuration folder. Open your project and see if the drop-down list works.
If method 1 solves the problem, just carry on. If method 2 solves the problem, you could try importing your settings from your other configuration folder (import/export in the options dialog), otherwise, create new ones.
Graeme