VST Instruments Unload Randomly

Anyone run into this?

This just started happening this weekend (August 12, 2023). I load a VST Instrument and start playing it, and then it randomly unloads while I’m playing. I’ve never had this issue in the past. It appears to have happened after the most recent Windows update (mid August).


DAW: Cubase 12 Pro (12.0.70 - Build 464)

Processor 13th Gen Intel(R) Core™ i9-13900K 3.00 GHz 24 Cores 32 Logical Processors
Installed RAM 128 GB (128 GB usable)
System type 64-bit operating system, x64-based processor
Edition Windows 11 Pro
Version 10.0.22621
OS build 22621.1848
Experience Windows Feature Experience Pack 1000.22642.1000.0

Program Drive: 4TB SSD
Audio Drive: 8TB SSD
VST Content Drive: 8TB SSD
Storage Drive: 16TB HDD
External Storage: 10TB HDD
Carbonite Backup


How do you know it unloads, please? What does it look like in Cubase? What happens?

This is an example VST piano plug-in. I’ve tried it with other VSTs as well, it doesn’t matter. I’ll drag a VST her to load it. Then I’ll start playing and after several seconds of playing it just disappears.

Martin - Where I have the arrow pointing in the above screenshot just disappears while I’m playing, and of course, the sound from the VST stops. It’s a behavior I’ve never seen before this weekend.


Could you attach a screenshot from the Inspector, please?

Do you mean the instrument or the MIDI data diaper?

Here’s the before and after. As you can see the before has the MIDI track assigned to the VST (TruePianos) and all is fine.

I start playing my midi keyboard … not even running the recorded track, just playing the VST from my midi keyboard. Then after a few seconds, the VST disappears and the MIDI track’s assignment says “Missing”, and this time, the cycle button activated on its own!

Unplug the MIDI keyboard, restart Cubase, Use ALT+K to open the virtual keyboard and play on that.
Does it still delete the track while playing?

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I think this issue is indeed related to the midi keyboard. Something got corrupted it appears and it was sending various commands, depending on what keys I was playing. After rebooting the midi keyboard, it appears to be okay. I’m going to keep playing to make sure that I’m back to normal here. I appreciate all of the help! Thanks again!

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Do you Disable a track by any chance?

What kind of keyboard do you use? How is it integrated into Cubase?

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I use an Arturia KeyLab 61 MKII connected by USB. I’ve had it for a few years, it’s great and I’ve never had an issue with it until today, but after rebooting it, it’s working fine now.

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