celllist multi select opens current page in new window?

I would think I tested this before, but during some testing of my gwt page today I noticed that when I try to multi-select from my cellist, "something" is firing and opening a new window/tab with my current page.

My multiselect for the celllist is simple:

        // Add a selection model using the same keyProvider.

        final MultiSelectionModel<docWithId> selectionModel = new MultiSelectionModel(keyProvider);

        cellList.setSelectionModel(selectionModel);

When I try to "shift-select" or "ctrl-select" in Chrome or IE11 (on Windows 8), a new window launches!

If anyone has any ideas where to start troubleshooting this, I would appreciate it.

-AJ

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