As my recent post on Make WordPress Plugins explains, there’s a serious problem in many themes and plugins using the content filter, and although this problem well known, it has largely been ignored by the WordPress community. :-/
I’d like your feedback on the new Block Filter Output (BFO) feature that will be enabled in WPSSO version 3.47.0 (currently in pre-release) — the Block Filter Output (BFO) feature attempts to make the content filter usable by monitoring the content filter for webpage output, and fixing incorrectly coded filter hooks (that send text to the webpage instead of returning it, as all filter hooks must). WPSSO version 3.47.0 will also enable the “Use WordPress Content Filters” option by default, and use the BFO feature to report any content filter issues.
If you are a Pro version user, you can try the latest pre-release / release candidate version by selecting the “Release Candidate and Up” version filter for WPSSO under the SSO > Update Manager settings page. Let me know if WPSSO reports any issues with your content filters — hopefully it won’t, but if it does, you’ll have the necessary information to contact the theme or plugin author and have them fix their code. ;-)