If you have issues with a third party plugin or service you must contact this third party.
Streamelements plugin breaks OBS. The right way to deal with this problem is to completely remove it. Use the uninstaller they provide, then go to %appdata%/obs-studio/ and manually delete all the leftover files they keep in there because this files insist in interact with OBS. Now uninstall and reinstall OBS just in case anything else got modified by this plugin.
If for whatever reason you want this plugin, contact directly streamelements for support on this.
Make sure the other plugins are updated and work correctly with this latest version of OBS.