IntelliJ IDEA 2016.3.1 does not finish launching
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I just installed the latest version of the IDE and now I can't even use it. The progress bar indicating it is being loaded never completes and the application does not start up.

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Delete IDE folders: https://intellij-support.jetbrains.com/hc/articles/206544519.
If it doesn't help, provide the logs and the thread dumps via jstack:
https://intellij-support.jetbrains.com/hc/articles/207241085
https://intellij-support.jetbrains.com/hc/articles/206544899
You can upload the files at https://intellij-support.jetbrains.com/hc/articles/206869619 or submit a ticket to support and attach the files to it.
I deleted the 2016.3 folder and when launching the IDE again I got an error about the Materialize UI plugin.
Make sure to delete the plugins folder, there will be no error if it's removed.