So, basically drumgizmo is no longer crashing for you … ?

Yes. But during create a backtrace.

ltgr@ltgr-Lenovo-V580c ~ $ /opt/Ardour-4.7.0/bin/ardour4 --gdb
GNU gdb (Ubuntu 7.7.1-0ubuntu5~14.04.2) 7.7.1
Copyright © 2014 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later http://gnu.org/licenses/gpl.html
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law. Type “show copying”
and “show warranty” for details.
This GDB was configured as “x86_64-linux-gnu”.
Type “show configuration” for configuration details.
For bug reporting instructions, please see:
Find the GDB manual and other documentation resources online at:
For help, type “help”.
Type “apropos word” to search for commands related to “word”…
Reading symbols from /opt/Ardour-4.7.0/bin/ardour-4.7.0…(no debugging symbols found)…done.
(gdb) run
Starting program: /opt/Ardour-4.7.0/bin/ardour-4.7.0
[Thread debugging using libthread_db enabled]
Using host libthread_db library “/lib/x86_64-linux-gnu/libthread_db.so.1”.
bind txt domain [gtk2_ardour4] to /this/cannot/exist
Ardour4.7.0 (built using 4.7 and GCC version 4.4.7)
ardour: [INFO]: Your system is configured to limit Ardour to only 4096 open files
[New Thread 0x7fffea294700 (LWP 8590)]
ardour: [INFO]: Loading system configuration file /opt/Ardour-4.7.0/etc/system_config
Loading user configuration file /home/ltgr/.config/ardour4/config
CPU vendor: GenuineIntel
ardour: [INFO]: AVX-capable processor
ardour: [INFO]: CPU brand: Intel® Core™ i5-3230M CPU @ 2.60GHz
ardour: [INFO]: Using SSE optimized routines
[New Thread 0x7fffe9a93700 (LWP 8591)]
[New Thread 0x7fffe9292700 (LWP 8592)]
[New Thread 0x7fffe8a91700 (LWP 8593)]
[New Thread 0x7fffdaffc700 (LWP 8594)]
[New Thread 0x7fffda7fb700 (LWP 8595)]
Cannot xinstall SIGPIPE error handler
ardour: [INFO]: Loading default ui configuration file /opt/Ardour-4.7.0/etc/default_ui_config
ardour: [INFO]: Loading user ui configuration file /home/ltgr/.config/ardour4/ui_config
ardour: [INFO]: Loading color file /opt/Ardour-4.7.0/etc/dark.colors
ardour: [INFO]: Loading ui configuration file /opt/Ardour-4.7.0/etc/clearlooks.rc
ardour: [INFO]: Loading ui configuration file /opt/Ardour-4.7.0/etc/clearlooks.rc
[New Thread 0x7fffd8e56800 (LWP 8596)]
[New Thread 0x7fffd87c8700 (LWP 8597)]
[New Thread 0x7fffd8747700 (LWP 8598)]
[Thread 0x7fffd8747700 (LWP 8598) exited]
[Thread 0x7fffd87c8700 (LWP 8597) exited]
[New Thread 0x7fffd87c8700 (LWP 8599)]
[New Thread 0x7fffd8747700 (LWP 8600)]
[Thread 0x7fffd8747700 (LWP 8600) exited]
[Thread 0x7fffd87c8700 (LWP 8599) exited]
[New Thread 0x7fffcb76e700 (LWP 8601)]
[New Thread 0x7fffcab57700 (LWP 8602)]
[New Thread 0x7fffca356700 (LWP 8603)]
[New Thread 0x7fffc9b55700 (LWP 8604)]
Found nothing along /home/ltgr/.config/ardour4/templates:/opt/Ardour-4.7.0/share/templates
run dialog
[Thread 0x7fffcab57700 (LWP 8602) exited]
[Thread 0x7fffc9b55700 (LWP 8604) exited]
Announcement is:
[Thread 0x7fffd8e56800 (LWP 8596) exited]
[New Thread 0x7fffd87c8700 (LWP 8606)]
[New Thread 0x7fffd8747700 (LWP 8607)]
[New Thread 0x7fffc8ed3700 (LWP 8608)]
Scanning folders for bundled LV2s: /opt/Ardour-4.7.0/lib/LV2
[New Thread 0x7fffc9b55700 (LWP 8610)]
[Thread 0x7fffc9b55700 (LWP 8610) exited]
Set cursor set to default
[New Thread 0x7fffc8ac7700 (LWP 8611)]
[New Thread 0x7fffc8a46700 (LWP 8612)]
[New Thread 0x7fffc89c5700 (LWP 8613)]
Set buffering params to 262144|131072|10|10
[New Thread 0x7fffc8943800 (LWP 8614)]
[New Thread 0x7fffc9b55700 (LWP 8615)]
[New Thread 0x7fffc80c8700 (LWP 8616)]
[New Thread 0x7fffac896700 (LWP 8617)]
Starting disk thread…[New Thread 0x7fffac815700 (LWP 8618)]
EQ support: no
[Thread 0x7fffac815700 (LWP 8618) exited]
[New Thread 0x7fffac794700 (LWP 8619)]
[Thread 0x7fffac794700 (LWP 8619) exited]
[New Thread 0x7fffac815700 (LWP 8620)]
Stopping disk thread…OK
[Thread 0x7fffac815700 (LWP 8620) exited]
Starting disk thread…[New Thread 0x7fffac815700 (LWP 8621)]
EQ support: no
[Thread 0x7fffac815700 (LWP 8621) exited]
[New Thread 0x7fffac794700 (LWP 8622)]
[Thread 0x7fffac794700 (LWP 8622) exited]
[New Thread 0x7fffac815700 (LWP 8623)]
Stopping disk thread…OK
[Thread 0x7fffac815700 (LWP 8623) exited]
Starting disk thread…[New Thread 0x7fffac815700 (LWP 8624)]
EQ support: no
[Thread 0x7fffac815700 (LWP 8624) exited]
[New Thread 0x7fffac794700 (LWP 8625)]
Scheduling ‘/home/ltgr/Samples/German Lautenwerck/Giga/German Lautenwerck.gig’ (Index=0) to be loaded in background (if not loaded yet).
[New Thread 0x7fffac815700 (LWP 8626)]
Loading gig file ‘/home/ltgr/Samples/German Lautenwerck/Giga/German Lautenwerck.gig’…OK
Loading gig instrument (’/home/ltgr/Samples/German Lautenwerck/Giga/German Lautenwerck.gig’,0)…Set buffering params to 262144|131072|10|10
Skip explicit buffer seconds, preset in use
Skip explicit buffer seconds, preset in use
Caching initial samples…OK
[New Thread 0x7fffcab57700 (LWP 8627)]
[New Thread 0x7fff87fff700 (LWP 8628)]
[New Thread 0x7fff877fe700 (LWP 8629)]
[Thread 0x7fff877fe700 (LWP 8629) exited]
[New Thread 0x7fff877fe700 (LWP 8630)]
[New Thread 0x7fff86ffd700 (LWP 8631)]
[Thread 0x7fff86ffd700 (LWP 8631) exited]
[New Thread 0x7fff86ffd700 (LWP 8632)]

Program received signal SIGSEGV, Segmentation fault.
0x00007fffac07e9d2 in GUI::PixelBufferAlpha::setPixel(unsigned long, unsigned long, unsigned char, unsigned char, unsigned char, unsigned char) ()
from /usr/lib/lv2/drumgizmo.lv2/drumgizmo.so
(gdb) thread apply all bt
Cannot find new threads: generic error

Please don’t double post stuff like this. The bug report is where discussion of this should continue.