Hi,
Thanks for the message. I hope I can help you.
Regarding the Return Key Not Rendering Effects:
You're absolutely right that pressing Return used to trigger rendering in the timeline. In Premiere Pro 25.5, there were some changes to keyboard shortcut defaults. It’s possible that the shortcut was removed or reassigned during the update. You can manually reassign it by going to:
Premiere Pro > Keyboard Shortcuts Search for “Render Effects in Work Area” or “Render Selection” Then reassign Return/Enter if it’s currently unassigned.
Does that fix the issue?
About your issue you're seeing with H.264 (Match Source Adaptive High Bitrate), it could be related to GPU encoding, bitrate spikes, or how transitions are being processed during export. A few things to try:
Switch to Software Encoding In the Export Settings dialog, under Encoding Settings, change Performance from Hardware Encoding to Software Encoding. This can help avoid GPU-related glitches.
Try a Different H.264 Preset Instead of “Match Source Adaptive High Bitrate,” try “High Quality 1080p HD” or manually set a CBR (Constant Bitrate) around 20–30 Mbps.
Clear Media Cache Go to Premiere Pro > Preferences > Media Cache and clear the cache. Corrupted cache files can sometimes cause export issues.
Check for Plugin Conflicts If you’re using third-party transitions or effects, try disabling them to see if the issue persists.
Let us know if any of these steps help, or if you’d like to share a sample project file for deeper investigation. We’re here to help!
Best,
Kevin
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