I have been using K3b for audio burning on my PC and suddenly today it doesn't burn audio projects.

I get an error that states:

cdrecord has no permission to open device
Modify device settings in K3b to solve this problem

What's going on here? I must have unknowingly modified some setting somehow.

I ran this debugging output:

Devices
-----------------------
hp DVD-RAM SW820 UH05 (/dev/sr0, CD-R, CD-RW, CD-ROM, DVD-ROM, DVD-R, DVD-RW, DVD-R DL, DVD+R, DVD+RW, DVD+R DL) [DVD-ROM, DVD-R Sequential, DVD-R Dual Layer Sequential, DVD-R Dual Layer Jump, DVD-RAM, DVD-RW Restricted Overwrite, DVD-RW Sequential, DVD+RW, DVD+R, DVD+R Dual Layer, CD-ROM, CD-R, CD-RW] [SAO, TAO, RAW, SAO/R96P, SAO/R96R, RAW/R16, RAW/R96P, RAW/R96R, Restricted Overwrite, Layer Jump] [%7]

System
-----------------------
K3b Version: 17.12.3
KDE Version: 5.44.0
Qt Version: 5.9.5
Kernel: 4.15.0-42-generic

Used versions
-----------------------
cdrecord: 1.1.11

cdrecord
-----------------------
/usr/bin/wodim: Operation not permitted. Warning: Cannot raise RLIMIT_MEMLOCK limits.
/usr/bin/wodim: Resource temporarily unavailable. Cannot get mmap for 12587008 Bytes on /dev/zero.
Text len: 738
TOC Type: 0 = CD-DA

cdrecord command:
-----------------------
/usr/bin/wodim -v gracetime=2 dev=/dev/sr0 speed=40 -sao driveropts=burnfree textfile=/tmp/k3b.s13784 -useinfo -audio /tmp/k3b_audio_0_01.inf /tmp/k3b_audio_0_02.inf /tmp/k3b_audio_0_03.inf /tmp/k3b_audio_0_04.inf /tmp/k3b_audio_0_05.inf /tmp/k3b_audio_0_06.inf /tmp/k3b_audio_0_07.inf /tmp/k3b_audio_0_08.inf /tmp/k3b_audio_0_09.inf /tmp/k3b_audio_0_10.inf /tmp/k3b_audio_0_11.inf /tmp/k3b_audio_0_12.inf /tmp/k3b_audio_0_13.inf /tmp/k3b_audio_0_14.inf

Same for me, with identical informations

cdrecord has not the permission !!
I installed Brasero and all is OK !