If you are the lucky patient zero for this problem you should create a thread in the forum or send the developers an email to begin to investigate the problem.. To make matters worse once you've found this conflict you will either have to leave the second plugin deactivated or try to find the version you had installed before the update assuming you knew what it's version number was.. These are usually found on the WordPress. orgpage for the plugin if it is freely available or the plugin or developer website if it is a premium plugin... Starting your own forum thread will require creating a WordPress. orgaccount if you don't have one or logging into the account you created when you purchased the premium plugin.. There are services such as VaultPress that will allow you to backup everything though you could simply download the wp-content plugins folder using an FTP program such as FileZilla..
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