File Open dialog error - GTK?

[sunrat]

I'm getting this error trying to open a file from the File>Open dialog in several apps:

This happens in Audacity, GIMP, Alsaplayer and maybe others, all which are GTK apps (I think). Opening the same from QMMP, Clementine, Gwenview etc. works fine. I can open these files with drag'n'drop or Open With... menu from Dolphin, and it works if I navigate via "File System" in the same GTK file request box.
Any ideas how to fix this? I'm a recent refugee from aptosid which didn't have this problem (aptosid had a fatal problem on my install with Nvidia which doesn't occur in siduction). Here is fstab in case it matters:-

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UUID=677EE28C54F5FC0F                         /media/disk1part1    ntfs         auto,users,ro,dmask=0022,fmask=0133,nls=utf8  0    0  
UUID=6bfdc98a-526c-4d4d-a671-43e364f5e4e9     /media/disk1part2    ext4         auto,users,rw,exec,noatime                   0    0  
UUID=e93986e1-5c60-4440-8544-0138116840ca     none                 swap         sw                                            0    0  
UUID=a2bb9da9-23ef-4f4b-8e17-d77de152ad81     /media/disk1part5    ext4         auto,users,rw,exec,noatime                   0    0  
UUID=475816b0-fa24-4ff2-b16d-3c9b8a1fe33c     /                    ext4         defaults,noatime,errors=remount-ro           0    1  
UUID=45CE-DB68                                /media/disk2part1    vfat         auto,users,rw,quiet,umask=000,shortname=lower 0    0  
UUID=45CE-DB69                                /media/disk2part2    vfat         auto,users,rw,quiet,umask=000,shortname=lower 0    0  
UUID=7605433f-5c96-4d6c-bb11-a1818eda16d4     /media/disk3part1    ext3         auto,users,rw,exec,relatime                   0    0

[devil]

can we also see the output of mount and  blkid?

greetz
devil

[sunrat]

As requested. This is a new install from Desperado Reloaded only 2 weeks ago. I just noticed it works fine if I scroll down and select the partition from the "105GB Filesystem" etc. Only doesn't work for the "diskxpartx" section. So it's more an annoyance than a major problem, the "diskxpartx" entries are redundant and useless.

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root@siductionbox:/home/roger# mount
sysfs on /sys type sysfs (rw,nosuid,nodev,noexec,relatime)
proc on /proc type proc (rw,nosuid,nodev,noexec,relatime)
udev on /dev type devtmpfs (rw,relatime,size=10240k,nr_inodes=504977,mode=755)
devpts on /dev/pts type devpts (rw,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=000)
tmpfs on /run type tmpfs (rw,nosuid,noexec,relatime,size=405344k,mode=755)
/dev/disk/by-uuid/475816b0-fa24-4ff2-b16d-3c9b8a1fe33c on / type ext4 (rw,noatime,errors=remount-ro,data=ordered)
tmpfs on /run/lock type tmpfs (rw,nosuid,nodev,noexec,relatime,size=5120k)
tmpfs on /run/shm type tmpfs (rw,nosuid,nodev,noexec,relatime,size=1274940k)
fusectl on /sys/fs/fuse/connections type fusectl (rw,relatime)
/dev/sda1 on /media/disk1part1 type fuseblk (ro,nosuid,nodev,noexec,relatime,user_id=0,group_id=0,default_permissions,allow_other,blksize=4096)
/dev/sda2 on /media/disk1part2 type ext4 (rw,nosuid,nodev,noatime,data=ordered)
/dev/sda5 on /media/disk1part5 type ext4 (rw,nosuid,nodev,noatime,data=ordered)
/dev/sdb1 on /media/disk2part1 type vfat (rw,nosuid,nodev,noexec,relatime,fmask=0000,dmask=0000,allow_utime=0022,codepage=cp437,iocharset=utf8,shortname=lower,quiet,utf8,errors=remount-ro)
/dev/sdb2 on /media/disk2part2 type vfat (rw,nosuid,nodev,noexec,relatime,fmask=0000,dmask=0000,allow_utime=0022,codepage=cp437,iocharset=utf8,shortname=lower,quiet,utf8,errors=remount-ro)
/dev/sdc1 on /media/disk3part1 type ext3 (rw,nosuid,nodev,relatime,errors=continue,barrier=1,data=writeback)
/dev/sdc2 on /media/disk3part2 type ext3 (rw,nosuid,nodev,relatime,errors=continue,barrier=1,data=writeback)
/dev/sdc3 on /media/disk3part3 type ext3 (rw,nosuid,nodev,relatime,errors=continue,barrier=1,data=writeback)
rpc_pipefs on /var/lib/nfs/rpc_pipefs type rpc_pipefs (rw,relatime)
root@siductionbox:/home/roger# blkid
/dev/sda1: LABEL="WIN7" UUID="677EE28C54F5FC0F" TYPE="ntfs"
/dev/sda2: UUID="6bfdc98a-526c-4d4d-a671-43e364f5e4e9" TYPE="ext4"
/dev/sda5: UUID="a2bb9da9-23ef-4f4b-8e17-d77de152ad81" TYPE="ext4"
/dev/sdb1: UUID="45CE-DB68" TYPE="vfat"
/dev/sdb2: UUID="45CE-DB69" TYPE="vfat"
/dev/sdc1: UUID="7605433f-5c96-4d6c-bb11-a1818eda16d4" SEC_TYPE="ext2" TYPE="ext3"
/dev/sdc2: UUID="897ea0e5-eef2-4574-a5a9-76a3dad7beb0" SEC_TYPE="ext2" TYPE="ext3"
/dev/sdc3: UUID="e6e1d8eb-1cc9-46d8-998c-d88c83fe3bc9" SEC_TYPE="ext2" TYPE="ext3"
/dev/sda3: UUID="e93986e1-5c60-4440-8544-0138116840ca" TYPE="swap"
/dev/sda6: UUID="475816b0-fa24-4ff2-b16d-3c9b8a1fe33c" TYPE="ext4"