When you do an upgrade the cache gets cleared. This means it must redownload and reinstall all the add-ons.
Sometimes this can take more time than it takes for OH to go from startlevel 0 to start level 40 where rules can start running.
Othertimes the installation of the addons can fail for various reasons.
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Wait a bit.
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If the errors keep happening try restarting OH and watch for errors installing add-ons messages in the logs.
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If there are errors installing add-ons or the errors persist, try Clear the Cache. Return to step 1 if necessary. If you get to step 3 again, something weird is going on.