Known Participant

Premiere Pro – Unable to add clips to timeline after trimming source

Forum|Forum|1 day ago
September 2, 2026
6 replies
17 views

I'm experiencing a reproducible issue in Premiere Pro 26.3.2 on Windows, and I've confirmed the same behavior in 25.6.6.

Premiere initially works normally. I can open a clip in the Source Monitor and add it to the timeline. However, after trimming/setting In and Out points on a source clip, Premiere suddenly stops allowing me to add media to the timeline.

Symptoms:

Cannot drag source clips into the timeline.
Insert/Overwrite also stops working.
Existing timeline clips can still be trimmed.
Existing clips can still be moved using the keyboard.
Keyframes can still be edited.
Tracks are not locked.
Source patching (V1/A1) remains active.
General drag-and-drop/UI interaction still works.
The problem occurs across different projects.
Restarting Premiere restores normal operation, but the issue returns after working with/trimming source clips.
The same behavior occurs in Premiere Pro 26.3.2 and 25.6.6.

So this appears to be a Source Monitor / source editing issue rather than a timeline lock, source-patching, or project-specific problem.

Has anyone encountered this behavior, or found what specifically causes it?

Nicolas Alexander OttoAuthor

Known Participant

Sadly neither did help. However I reimportet some clips into an existing project and weirdly enough some of the clips worked other did not. However to make things more confusing, some of the clips do work in one projects but not in another project. Even though I did create all of my recent projects from the same template. It seems to be almost random.

Amy the Stuv

Community Manager

Hello @Nicolas Alexander Otto,

Welcome back to the Premiere Forums. This is a strange one. I’m wondering if you could post your current system specs requested in How do I write a bug report?

We could also use some info from the Helpful context section. Have you tested this in a newly created project and a newly created Timeline? Does it happen every time you set in and out points on a Source Clip in the Source Monitor or does it take a while before this happens?

Hoping we can help,

Amy

Nicolas Alexander OttoAuthor

Known Participant

Thank you for the reply!

Yes, this also happens with new projects, just tested it - usually after I insert one or two different clips - after trimming - to the timeline. After that it just stops working.

Video format does not seem to play a role, it happens with .mov .mp4 and .avi alike.

Windows 11

Here’s the GPU Information:

Amy the Stuv

Community Manager

Thank you @Nicolas Alexander Otto for providing your specs.

I do see that there was an update to the driver for your GPU this August. That could be worth a shot. This is a difficult problem to reproduce as it may be system specific.

Allow me to throw some spaghetti on the wall to see what sticks. I’m not certain if this has anything to do with it or if it is accurate, but I wonder if sometimes dual monitor systems where the monitors are set to different resolutions may trip up inter-panel communication. One thing to try, and just see if it does anything, is changing your Workspace or changing temporarily to a Single Monitor setup and see if you can edit normally again. As I said, this is a spaghetti on the wall suggestion. I’ll reach out internally to see if anyone else knows what might cause this.

Let me know if the driver update works and if my spaghetti test does anything.

Best,

Amy

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