LV2 plugin GUI won't instantiate

I’m new to Linux & to Ardour. I’m using Ardour 4.7 on Fedora 23 with a RT kernel from Planet CCRMA

I’ve installed LV2 and some plugins - notably EQ10Q. I can select them from the mixer strip and they show up OK there. But no controls show up & I get the message:

[ERROR]: failed to instantiate LV2 GUI

I have no idea why, and can’t find any help via Google. Any help would be very gratefully received.

Which gcc was Ardour 5.12 64 bit Linux built with ? I’m having this exact problem on Manjaro with EQ10Q built with the default gcc 7.2.0.

Ok, found a workaround. The eq10q developer is aware of the problem and offers his own binary installer that uses Ardour compatible precompiled libraries (

Done and EQ10Q gui works again :slight_smile:

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Saved too fast, here is the cleaned up procedure:

Check Menu > Help > About > Config and see if “LV2 UI embedding: True”, if so, the most likely cause for this is a mismatch gcc4/gcc5 (ardour was compiled with one, eq10q with the other).

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Thank you so much @mhartzel! Worked for me on Ardour 5.12 on Linux Mint 18.2.