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1) Close all Adobe applications and confirm from task manager if all the applications and processes related to Adobe are closed.
2) Click notification area and check if there is any application like webcom, if yes please right click and exit.
3) Open programs and features from control panel and uninstall webcom adware from lavasoft.
4) Relaunch Indesign and check.
Please feel free to revert if issue still persists or contact support as suggested above.
Lost my temper with the preferences-solution.
Temporary workaround: open an indd-file (either from the miniature picture or directely from the file), then clicking cursor onto a page and typing random text > flashing circle gone and everything working OK (until the next time).
Finally: @ohmath, 1 and 2 not helpful, but 3) found lavasoft and uninstalled it, although not sure if that's healthy for the computer. At least InDesignCC2017 stopped showing me the flashing blue circle.