LT Theme Compatibility and Post-Update Troubleshooting

Use this guide when an LT site starts behaving oddly after a WordPress, theme, or plugin update. Older articles may say Pixelgrade LT themes only work up to WordPress 6.2.2 — that guidance is outdated and you can ignore it.

LT themes work with WordPress 6.9.1 and newer. The real cause of most post-update issues is an outdated Anima build, a plugin-specific regression, stale block markup that needs recovery, or a conflict triggered by the Gutenberg plugin or another plugin.

Current LT baseline

Confirm your site matches the current supported WordPress, PHP, and plugin versions before anything else. The Theme Requirements article is the source of truth.

If your site is running a much older LT setup than those versions, update the theme and its required plugins first. Many post-update issues come from running a new WordPress core version on top of older LT components.

Checking the setup before considering a rollback

Capture a quick snapshot of your environment so you can tell which component is actually misbehaving. Work through this list first.

1. Confirm which LT theme is active and note its version.
2. Confirm the Anima version.
3. Confirm the versions of Pixelgrade Care, Nova Blocks, and Style Manager.
4. Check whether the Gutenberg plugin is installed and active.
5. Identify whether the issue affects the frontend only, the editor only, or both.

The fix depends on the symptom. A site showing raw HTML separators after a Nova Blocks update is a different problem from a page showing an Attempt recovery warning inside the editor.

Troubleshooting by symptom

Match the exact symptom to one of the scenarios below, then follow the steps for that scenario.

Recovering from “This block contains unexpected or invalid content”

This warning usually means the block markup on the page is older than the current block definition, or that a theme or plugin update changed the block.

1. Open the affected page in the editor.
2. Click Attempt recovery on the affected block.
3. Save the page.
4. Repeat for any other affected blocks on that page.

If the issue disappears after recovery, you do not need to roll back WordPress. If the problem keeps coming back across multiple pages, continue with the checks below — you may be dealing with an outdated plugin or a broader compatibility issue.

Fixing “This block has encountered an error and cannot be previewed”

If blocks stop previewing or become uneditable, the cause is almost always the Gutenberg plugin or an outdated LT component rather than the page content itself.

1. Deactivate the Gutenberg plugin if it is active.
2. Update the LT theme, Pixelgrade Care, and Nova Blocks to their latest available versions.
3. Test the same block on a fresh page.
4. Temporarily deactivate non-essential plugins and test again.

If the block fails even on a fresh page, it is likely a plugin conflict, an outdated LT component, or a known regression.

Handling a frontend that broke right after updating a plugin

If the problem appeared immediately after updating a plugin, check whether the symptoms match a known regression before touching WordPress core.

• Style Manager: site crash, fatal error, white screen, or inaccessible wp-admin.
• Nova Blocks: strange separators, raw HTML, or span tags showing on the frontend.

Start by identifying the exact plugin and version that changed, then work through the steps below.

1. Reinstall the affected plugin if needed.
2. Clear all caching layers.
3. Hard refresh the browser.
4. Re-test before changing WordPress core.

Diagnosing an editor that works but a frontend that looks wrong

When the editor looks fine but the frontend is broken, the issue is almost always one of these:

• Stale cache.
• A frontend-only plugin regression.
• A markup mismatch in custom HTML or in third-party form or plugin output.
• A theme or plugin interaction specific to that block or page.

Start by clearing your caching layers and confirming whether the issue still reproduces in a private browser window.

Deciding when a rollback is actually appropriate

Rollback is not the first step for LT themes. Consider it only when one of these is true:

• Your LT theme is on an older Anima version and cannot be updated yet.
• A confirmed regression affects your current setup and no patched version is available yet.
• Support explicitly confirms that your exact installed combination needs a temporary rollback.

When a rollback is necessary, change as little as possible and only after noting your current versions.

1. Back up the website.
2. Confirm the exact component that likely caused the issue.
3. Roll back only that component first if possible.
4. Re-test before changing anything else.

Rolling back WordPress core without checking your plugin and LT component versions first usually creates extra work and can hide the real cause.

Related guides

Follow up with these guides if you need more detail on a specific block error.

• Unexpected or Invalid Content Block Error.
• How to get past the “This block has encountered an error and cannot be previewed” error.